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High Frequency Amplifier / High Speed
Circuits / Wide Band Amplifier Circuits
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Amplifier -- Main Page
Last Updated on:
Friday, March 23, 2012 04:35 PM |
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Circuits Designed by Dave Johnson, P.E. : |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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Single Sideband Demodulator Covers the HF Band - 10/26/00
EDN-Design Ideas The circuit in Figure 1 complements a previous
Design Idea ( SSB modulator covers HF band EDN , Sept 30, 1999,
pg 122]. The modulator employs a phasing.… [Design Idea by Israel
Schleicher, Bakersfield, CA] |
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Synthesized HF Receiver - This receiver was originally
designed for simplicity and low cost, but, like other projects, it
grew. My receiver is now synthesized and the performance is quite
comparable to many commercial designs. The unusual features of this
design are: * Common AF transistors and AF
circuitry have been used for the IF amp, in a transformerless design.
This aids construction and stability.; * IF
bandwidth is restricted by conventional L.C. tuned circuits which are
not damped by any resistive or active devices. This gives a
performance, even for CW working. The IF is 500KHz and NOT 465KHz.;
* Options for three different Local Oscillators. I used a Marconi
Sig.Gen. with this receiver for over a year, before I overcame
lethargy and built a decent LO.... [Design by Harry Lythall - SM0VPO] |
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TBA120 Narrowband FM Receiver - Here is a nice little receiver for narrow-band
FM reception. It can also be used to receive FSK, RTTY and PACKET signals from the HF
bands. Basic receiver sensitivity is in the region of 1uV PD and the receiver can be tuned
to almost any frequency from 100KHz up to probably 120MHz. Ok then, here is the circuit
diagram.... [Design by Harry Lythall - SM0VPO] |
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Wide Band RF Amplifier for 10MHz-500MHz Input - This paper describes an RF
amplifier circuit which is suitable for the frequencies between 10MHz and 500MHz. These
kind of amplifiers are called wide band amplifiers.(07/07/07) [Author is Yilmaz Kalafat,
PE1PYJ] |
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Wide Band Zero Cross Detector - This circuit was designed to convert a low
amplitude 40KHz signal into a clean square wave signal. It will work with inputs as
small as 5mv peak-to-peak or as large as 3 volts peak to peak. The input frequency
can range from a few kilohertz to about 150KHz. …. [Designed by David A. Johnson] |
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Wideband AGC has 60 DB Dynamic Input Range - 10/10/96 EDN-Design
Ideas: Automatic-gain-control (AGC] circuits serve in many applications to maintain
signals at fixed levels. However, in applications such as digital-receiver circuits and
back-channel modems, the function of the AGC often aims more at increasing dynamic input
range through the controlled application of both gain and attenuation. In this type of
application, the AGC is usually upstream of a high-speed ADC. The.... [Design Idea by Carl
Dickey, National Semiconductor, Comlinear Division] |
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Wideband Low Distortion Techniques Apex-AN17 - Apex App Note (added 08/08/08)
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Wideband Low Noise Amplifier Drives 50 Ohm Loads - 10/23/97 EDN-Design Ideas
The circuit in Figure 1 is a wideband, high-gain amplifier with two useful features not
often found in combination The input-referred noise is 2.6 nV/(square root Hz], yet
it can deliver 27 dBm into a double-terminated 50 ohm load or 30 dBm into a
single-terminated load. The circuit uses two monolithic op amps.... [Design Idea by
Mitchell Lee, Linear Technology Corp, Milpitas, CA] |
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Wideband Op Amp Capable of µPower Operation - National Semiconductor Application
Note 24-Oct-2001 (app note added 1/03) |
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Wideband peak detector operates over wide input frequency range - 22-Nov-07
Issue of EDN An ultrafast comparator and associated circuitry enable peak detection
over a wide input-frequency and -voltage range.... [Design Idea by Jim McLucas, Longmont,
CO] |
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