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Demodulator Circuits
Last Updated on: Thursday, April 07, 2016 01:03 PM

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BER meter is easy to build -  03/02/00 EDN Design Idea   A bit-error-rate (BER]tester is a basic tool for digital-communications measurements. Although many commercial BER testers are available, you can easily design and build an inexpensive version. The scheme in Figure 1 has performan. . .[by Luis Miguel Brugarolas, Sire Sistemas y Redes Telmaticas, Tres Cantos, Madrid, Spain]

 

Bridging enhances filter close-in selectivity -  03/02/00 EDN Design Idea   A bit-error-rate (BER]tester is a basic tool for digital-communications measurements. Although many commercial BER testers are available, you can easily design and build an inexpensive version. The scheme in Figure 1 has performan. . .[by Luis Miguel Brugarolas, Sire Sistemas y Redes Telmaticas, Tres Cantos, Madrid, Spain] 

Circuit yields accurate absolute values -  07/05/01  EDN Design Idea   The circuit in Figure 1 delivers the absolute value of the input signal with an accuracy better than 10 ppm of the full-scale range. The circuit has low zero-crossing error. You can use it as an asynchronous demodulator, as a source. . .[by Marco Pisani, Istituto di Metrologia G Colonnetti, Turin, Italy]

 Clock Recovery Scheme Suits Low Snr Systems -  06/05/00 EDN Design Idea    (PDF Contains many designs, scroll to find this one) A clock-recovery architecture can operate with NRZ digital signals, even at low SNRs. A clock-recovery subsystem is based on a PLL comprising a phase comparator, a loop filter, and a voltage-controlled oscillator (VCO) . . .[by Luis Miguel Brugarolas, SIRE, Madrid, Spain]

 

Clock-recovery scheme suits low-SNR systems -  06/05/00 EDN Design Idea   A clock-recovery architecture can operate with NRZ digital signals, even at low SNRs. A clock-recovery subsystem is based on a PLL comprising a phase comparator, a loop filter, and a voltage-controlled oscillator (VCO]PDF Contains. . .[by Luis Miguel Brugarolas, SIRE, Madrid, Spain]

 

Demodulator Schematic/Design -  The demodulator block diagram below has three major sections that were implemented in this iteration of the design, the mixer, the filter, and the phase shift network . . .

 

Experimental 1 kHz Synchronous Demodulator -  This circuit employs a synchronous demodulator to separate a 1 KHz signal from noise and measuresthe amplitude of the 1 kHz signals once a second at about 60 microvolts per count then sends the measurements via an RS-232 interface for further processing or display. An LED on the board also lights when the measured signal exceeds a preset threshold. . .[From Dick Cappels' project pages]

 

Inverted Bipolar Transistor Doubles As A Signal Clamp -  06/07/01 EDN Design Idea   A number of circuits, such as level detectors and AM demodulators, benefit from a rectifier with a low offset voltage. Silicon diodes have an offset of approximately 0. 6V and do not work well in low-level circuitry. A Schottky di. . .[by Art Hogrefe, Puma Instrumentation, State College, PA]

 

Novel Idea Implements Low-Cost Keyboard -  04/03/03  EDN Design Idea   Many applications that use a microcontroller also use a keyboard. If your application uses a relatively powerful microcontroller, you can use several free I/O pins or an unused input with an ADC to effect an easy keyboard connection. . .[by Jean-Jacques Thevenin, Thomson Plasma, Moirans, France]

 

Novel method detects lock in Costas loops -  06/22/00  EDN Design Idea   In the well-established lock-detection scheme for conventional PLLs, the VCO or VCXO local oscillator splits the output into 0 and 90 signals (Figure 1). The incoming IF signal mixes with the 0 and 90 signals to perform phase lock. . .[by MR Raghavendra, ISRO Satellite Centre, Bangalore, India]

 

Self-modifying code extends addressing mode -  12/17/98 EDN Design Idea   (File contains many circuits. Scroll to find this one)As just about any assembly-language programmer knows, self-modifying code (SMC) is usually undesirable, unintentional, and destructive. However, the SMC routine in Listing 1 is extremely useful to extend the indexed, 16-bit offset addressing mode of the venerable HC05 C from 8 bits, or 256 locations, to the full 13-bit (8-kbyte) memory address space that the Cs architecture supports. . . [by Paul Sofianos, Motorola Inc, Tempe, AZ]

 

Simple BER meter is easy to build -  03/02/00 EDN Design Idea   A bit-error-rate (BER]tester is a basic tool for digital-communications measurements. Although many commercial BER testers are available, you can easily design and build an inexpensive version. The scheme in Figure 1 has performan. . .[by Luis Miguel Brugarolas, Sire Sistemas y Redes Telmaticas, Tres Cantos, Madrid, Spain]

 

Single-sideband demodulator covers the HF band -  10/26/00 EDN Design Idea   The circuit in Figure 1 complements a previous Design Idea   ( SSB modulator covers HF bandEDN , Sept 30, 1999, pg 122]. The modulator employs a phasing. . . [by Israel Schleicher, Bakersfield, CA]

 

Spread Spectrum Method Identifies Audio Path -  04/13/00 EDN Design Idea   An unusual method of audio spread spectrum can identify the audio path that's currently in use through a consumer-electronic device. The design in Figure 1a uses an injected audio spread-spectrum tag signal because a listener does not notice the low. . .[by Bob Dougherty, Nielsen Media Research]

 

Spread-spectrum method identifies audio path -  04/13/00 EDN Design Idea   An unusual method of audio spread spectrum can identify the audio path that's currently in use through a consumer-electronic device. The design in Figure 1a uses an injected audio spread-spectrum tag signal because a listener doe. . .[by Bob Dougherty, Nielsen Media Research]

 

Yield Accurate Absolute Values -  07/05/01  EDN Design Idea   The circuit in Figure 1 delivers the absolute value of the input signal with an accuracy better than 10 ppm of the full-scale range. The circuit has low zero-crossing error. You can use it as an asynchronous demodulator, as a source. . .[by Marco Pisani, Istituto di Metrologia G Colonnetti, Turin, Italy]

 

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Demodulator Circuits


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