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Demodulator Circuits
 

Last Updated: December 31, 2017 06:47 AM


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

400 bps PSK P3 Data Demodulator -  The Phase IIID satellite [launched 2000 Nov 16 and called OSCAR-40, failed early 2004] used a 400 bps PSK block-oriented format for engineering telemetry because a widespread ground station network was already in place from previous Phase III spacecraft missions. __ Designed by James Miller G3RUH

BER meter is easy to build -  03/02/00 EDN-Design Ideas  General filters are bandpass filters that usually employ bridging couplings between nonadjacent interstage couplings  (Reference 1].  This class of filters also includes bridging coupling across  filter input and output ports.  The implementation of input-to-output bridging already exists for a one-pole filter  (Reference 2].  For a two-pole filter, dielectric resonators help achieve input-to-output bridging coupling  (Reference 3]__ Circuit Design by Luis Miguel Brugarolas, Sire Sistemas y Redes Telmaticas, Tres Cantos, Madrid, Spain

Bridging enhances filter close-In selectivity -  03/02/00 EDN-Design Ideas  General filters are bandpass filters that usually employ bridging couplings between nonadjacent interstage couplings  (Reference 1].  This class of filters also includes bridging coupling across  filter input and output ports.  The implementation of input-to-output bridging already exists for a one-pole filter  (Reference 2].  For a two-pole filter, dielectric resonators help achieve input-to-output bridging coupling  (Reference 3]__ Circuit Design by Luis Miguel Brugarolas, Sire Sistemas y Redes Telmaticas, Tres Cantos, Madrid, Spain

Circuit Yields Accurate Absolute Values -  07/05/01  EDN-Design Ideas 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__ Circuit Design by Marco Pisani, Istituto di Metrologia G Colonnetti, Turin, Italy

Clock Recovery Scheme Suits Low-SNR Systems -  06/05/00 EDN-Design Ideas 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) __ Circuit Design by Luis Miguel Brugarolas, SIRE, Madrid, Spain

Demodulator Makes Low Cost Optical Tracker -  06/18/98 EDN-Design Ideas (Several circuits here, scroll to find this one.)  Demodulator makes low-cost optical trackerSteven Sarns, Kesta Technology Inc, Wheat Ridge, CO  A project required building a synchronous-demodulator circuit to track a line drawn on paper.  The beauty of the synchronous-modulator/demodulator approach is its inherent noise rejection.  The method rejects nearly all out-of-band noise, whether from internal drift or external illumination.  __ Circuit Design by Steven Sarns, Kesta Technology Inc, Wheat Ridge, CO

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 __ Designed by Dick Cappels

Inverted Bipolar Transistor Doubles as a Signal Clamp -  06/07/01 EDN-Design Ideas 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 diode is a bit better__ Circuit Design by Art Hogrefe, Puma Instrumentation, State College, PA

Novel Idea Implements Low-Cost Keyboard -  3-Apr-03 EDN-Design Ideas 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.  But, if the microcontroller in your system has too few free I/O pins and no on-chip ADC, you can be in trouble__ Circuit Design by Jean-Jacques Thevenin, Thomson Plasma, Moirans, France

Novel method Detects lock in Costas loops -  06/22/00 EDN-Design Ideas 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 locking and lock detection, respectively.  This method gives unambiguous results even under noisy conditions.   __ Circuit Design by MR Raghavendra, ISRO Satellite Centre, Bangalore, India

Self-modifying code extends addressing Mode -  12/17/98 EDN-Design Ideas 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.  This routine is very useful for error tables, text messages tables, or any array manipulation for a large number of elements.   Circuit Design   Paul Sofianos, Motorola Inc, Tempe, AZ

Simple Circuit BER meter is easy to build -  03/02/00 EDN-Design Ideas  General filters are bandpass filters that usually employ bridging couplings between nonadjacent interstage couplings  (Reference 1].  This class of filters also includes bridging coupling across  filter input and output ports.  The implementation of input-to-output bridging already exists for a one-pole filter  (Reference 2].  For a two-pole filter, dielectric resonators help achieve input-to-output bridging coupling  (Reference 3]__ Circuit Design 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 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.   __ Circuit Design by Israel Schleicher, Bakersfield, CA

Spread Spectrum Method Identifies Audio Path -  04/13/00 EDN-Design Ideas 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__ Circuit Design by Bob Dougherty, Nielsen Media Research

Yield Accurate Absolute Values -  07/05/01  EDN-Design Ideas 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__ Circuit Design by Marco Pisani, Istituto di Metrologia G Colonnetti, Turin, Italy


Demodulator Circuits


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