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High Frequency Amplifier / High Speed Circuits / Wide Band Amplifier Circuits
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Amplifier -- Main Page
Last Updated on:
Saturday, August 30, 2014 10:27 AM

 
Circuits Designed by Dave Johnson, P.E. :
 
  • 10MHz TO 20MHz LASER LIGHT DETECTOR
    This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system. It has good ambient light immunity … [Designed by David A. Johnson]  Added April 2005
     
  • 20MHz VCSEL 3mW LASER TEST CIRCUIT
    This circuit takes advantage of some new vertical cavity surface emitting lasers (VCSEL) that don’t require light output control circuits. The circuit shows how to drive the device from a single high speed CMOS IC. The circuit can easily be modified to tra … [Designed by David A. Johnson]  Added April 2005

 

  • 2Mhz Broad Band Optical Fiber Receiver - If you need more sensitivity than the above circuit this circuit provides about ten times more gain. It too is designed around an inexpensive plastic optical fiber detector.  … [Hobby Corner Circuit by Dave Johnson]  Added April 2005
     
  • 3mw Laser Test - 20Mhz VCSEL - This circuit takes advantage of some new vertical cavity surface emitting lasers (VCSEL) that don’t require light output control circuits. The circuit shows how to drive the device from a single high speed CMOS IC. The circuit can easily be modified to tra … [Hobby Corner Circuit by Dave Johnson]  Added April 2005
     
  • 50Mhz Broad Band Optical Fiber Receiver #A - If the above circuit it still too slow, you can try this circuit. What it lacks in sensitivity it makes up for in speed. The circuit attaches a plastic fiber optic PIN photodiode assembly to a small box containing a small 3v battery and a standard BNC plu … [Designed by David A. Johnson]  Added April 2005
  • BROAD BAND 5MHz OPTICAL FIBER RECEIVER
    This circuit is a simple broad band light detector that uses a very inexpensive IC and a PIN photodiode that is packaged for use with plastic optical fibers. It has a bandwidth from 1KHz to over 5MHz.  It is great for experimenting with various modulated light sources.
     
  • BROAD BAND 2MHz OPTICAL FIBER RECEIVER
    If you need more sensitivity than the above circuit this circuit provides about ten times more gain. It too is designed around an inexpensive plastic optical fiber detector.
  • C-MOS INVERTER MAKES LOW POWER AMP
    With the addition of one resistor and a capacitor, some common logic ICs can be transformed from digital to analog duties.  This circuit outlines some the features to expect from different inverter ICs.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

±120V Output Precision Op Amp- Simple shunt regulators provide normal supply levels to the op amp and the external open-loop gain and buffer structure extends the output swing to nearly the high-voltage rails. Output transistors are protected by current-limiting.… [Linear Technology App Note, Jun 21, 2011]

10Mhz To 20Mhz Laser Light Detector- This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system. It has good ambient light immunity… [Designed by David A. Johnson]

10Mhz To 20Mhz Light Receiver- Light power to volts conversion = APPROX. 15mV per microwatt at 850nM … [Designed by David A. Johnson]

10W HF Linear Amplifier- Electroinic circuit.… [from Harry Lythall's website]

1Hz to 10kHz Voltage to Frequency Converter- JFET inputs with anti phase-reversal circuitry allow the LTC1055/56 to be used as a precision, ultra-high impedance comparator. The precision provides for very high linearity of the V/F generation while the high speed allows a large frequency range of operation.… [Linear Technology App Note, Jun 21, 2011]

20Mhz Vcsel 3mw Laser Test Circuit- This circuit takes advantage of some new vertical cavity surface emitting lasers (VCSEL) that don’t require light output control circuits. The circuit shows how to drive the device from a single high speed CMOS IC. The circuit can easily be modified to tra… [Designed by David A. Johnson]

27MHz toy car receiver- RF circuits are not easy to build. The purpose of this page is to make the circuit diagrams available for educational purposes. I won't be able to help you contructing them or give more info than what is written on this page.… [Peter Jakab, Electrical Engineer, Engineer of Informatics]

2Mhz Broad Band Optical Fiber Receiver- If you need more sensitivity than the above circuit this circuit provides about ten times more gain. It too is designed around an inexpensive plastic optical fiber detector. … [Hobby Corner Circuit by Dave Johnson]

3.3V Baseband Video Splitter/Cable Driver (DC Coupled)- A simple video splitter application using an LT6206. Both amplifiers are driven by the input signal and each is configured for a gain of two, one for driving each output cable. Here again careful input biasing is required (or a negative supply as suggested previously) .… [Linear Technology App Note, Mar 25th 2010]

3.3V Single Supply LT6551 RGB Plus SYNC Cable Driver (DC Coupled)- The LT6551 drives four cables and operating from a single 3.3V supply. The inputs need to have signals centered at 0.83V for best linearity. This application would be typical of standard-definition studio-environment signal distribution equipment (RGBS format) .… [Linear Technology App Note, Mar 25th 2010]

3mw Laser Test - 20Mhz Vcsel- This circuit takes advantage of some new vertical cavity surface emitting lasers (VCSEL) that don’t require light output control circuits. The circuit shows how to drive the device from a single high speed CMOS IC. The circuit can easily be modified to tra… [Hobby Corner Circuit by Dave Johnson]

3W HF QRP Linear Amplifier- Electroinic design circuit.… [from Harry Lythall's website]

400MHz, 5V Single Supply Video Driver (AC Coupled)- The LT6557 400MHz triple video driver is specifically designed to operate in 5V single supply AC-coupled applications as shown. The input biasing circuitry is contained on-chip for minimal external component count. A single resistor programs the biasing level of all three channels.… [Linear Technology App Note, Mar 25th 2010]

5 Watt HF CW transmitter- This is a very simple 5 watt CW TX based upon a TTL logic chip. There is just one "tricky" component and this is Cx.  This component should have an impedance of about 10 - 50 ohms at the frequency of interest. If you wish to reduce the transmitter power, increase the value of Cx. It is Cx which causes the square wave from the output transistor to approximate a sine waveform. The value of Cx is the price of simplicity in this TX… [from Harry Lythall's website]

500mW HF Linear Amplifier- Electroinic design circuit.… [from Harry Lythall's website]

500w HF Linear Amplifier- Electroinic circuit.… [from Harry Lythall's website]

50Mhz Broad Band Optical Fiber Receiver Version A- If the above circuit it still too slow, you can try this circuit. What it lacks in sensitivity it makes up for in speed. The circuit attaches a plastic fiber optic PIN photodiode assembly to a small box containing a small 3v battery and a standard BNC plu… [Designed by David A. Johnson]

5Mhz Broad Band Optical Fiber Receiver- This circuit is a simple broad band light detector that uses a very inexpensive IC and a PIN photodiode that is packaged for use with plastic optical fibers. It has a bandwidth from 1KHz to over 5MHz.  It is great for experimenting with various modulated … [Hobby Corner Circuit by Dave Johnson]

700kHz, 1MΩ Single Supply Photodiode Amplifier- The measured output noise for this circuit was 153uVrms measured on a 1MHz bandwidth. Supply current was a low 2.2mA.… [Linear Technology App Note, Mar 22, 2010]

A 133MHz Differential Amplifier with External Gain Set, Impedance Matching to a 75Ω Source and Level Shifting- Complete single ended 75Ω input impedance to differential out, level shifting 2.5V input to 1.25V differential common mode, single ended to differential gain of 2 using external resistors circuit example.… [Linear Technology App Note, Oct 3, 2012]

Acoustic Thermometry Measures Temperature To 0.1 Degree- Start Clock Launches Acoustic Pulse into Measurement Path, Sets Width Decode Flip-Flop High. Acoustic Paths Return Pulse, Amplified by Receiver, Trips Trigger, Resetting Flip-Flop. Resultant Q Width Output, Representing Path’s Temperature Dependent Transit Time, is Converted to Temperature Reading by Microprocessor.… [Linear Technology App Note, Apr 29th 2011]

Active Antenna for AM-FM-SW- This simple little circuit can be used for AM, FM, and Shortwave (SW) . On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna.  It is further more designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios… [Tony van Roon's circuit]

Active Antenna for HF-VHF-UHF- This simple little circuit can be used for AM, FM, and Shortwave (SW) . On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna.  It is further more designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios… [Tony van Roon's circuit]

ADC Driver With Single-Ended Input to Differential Output- The LT6350 is a rail-to-rail input and output low noise single-ended to differential converter/ADC driver featuring fast settling time. It converts a high or low impedance, single-ended input signal to a low impedance, balanced, differential output suitable for driving high performance differential succesive approximation register… [Linear Technology App Note, Mar 31, 2010]

Broad Band 2Mhz Optical Fiber Receiver- If you need more sensitivity than the above circuit this circuit provides about ten times more gain. It too is designed around an inexpensive plastic optical fiber detector… [Designed by David A. Johnson]

Broad Band 50Mhz Optical Fiber Receiver Version A- If the above circuit it still too slow, you can try this circuit. What it lacks in sensitivity it makes up for in speed. The circuit attaches a plastic fiber optic PIN photodiode assembly to a small box containing a small 3v battery and a standard BNC plu… [Hobby Corner Circuit by Dave Johnson]

Broad Band 5Mhz Optical Fiber Receiver- This circuit is a simple broad band light detector that uses a very inexpensive IC and a PIN photodiode that is packaged for use with plastic optical fibers. It has a bandwidth from 1KHz to over 5MHz.  It is great for experimenting with various modulated … [Designed by David A. Johnson]

Build An Adjustable High-Frequency Notch Filter- 6-Feb-03 Issue of EDN  Although you can obtain universal, resistor-programmable switched-capacitor filters that are configurable as notch filters, most cannot operate at bandwidths higher than 100 kHz. Further, the typically 16- to 20-pin packages do not … [Design Idea by John Ambrose, Mixed Signal Integration Corp, San Jose, CA]

Clamped AC-Input Video Cable Driver- This circuit shows a means of driving composite video on standard 75Ω cable with just a single 3.3V power supply. This is possible due to the low output saturation levels of the LT6205 and the use of input clamping to optimize the bias point of the amplifi er for standard 1VP-P source video. The circuit provides an active… [Linear Technology App Note, Mar 25th 2010]

Composite Amp Provides High Gain And Bandwidth- 04/28/94 EDN-Design Idea  The composite circuit in Fig 1 couples the output drive and slew rate of a current-feedback amplifier, IC2, with the low-noise and low-offset characteristics of a voltage-feedback operational amplifier, IC1. The circuit achieves … EDN Design Idea  Mark Sauerwald, Comlinear Corp, Ft Collins, CO]

DC Stabilized 1000uV/msec Op Amp- Adding a discrete output stage provides full control of the circuit operating currents thereby obtaining very fast ac signal response. The LT1001 is used to adjust the output dc offset to a very low value, uVs, not typical for very high speed amplifier designs.… [Linear Technology App Note, Jun 21, 2011]

Dip Oscillator for HF- amateur radio construction projects.… [from Peter Parker's website]

 

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