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Demodulator Circuits

Circuit yields accurate absolute values: 07/05/2001 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 for logarithmic amplifiers, or simply as a demonstration of the wonders of feedback..

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)....

Demodulator Schematic/Design:

Inverted bipolar transistor doubles as a signal clamp: 06/07/01EDN-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...

Inverted bipolar transistor doubles as a signal clamp: 11/09/00 EDN-Design Ideas / A number of circuits, such as level detectors and AM demodulators, benefit from a rectifier with a low offset voltage....

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,...

QPSK Demodulator Is Good Match For Low Cost Modulator: 04/14/03 Electronic Design - Ideas for Design / This demodulator is suitable for the quadrature phase-shift keying (QPSK) modulator previously published by the same author, "Novel Low-Cost QPSK Modulator Needs No Adjustments" (electronic design, Sept. 16, 2002, p. 92). Also based on...

Self modifying code extends addressing mode: 12/17/98 EDN-Design Ideas / Self-modifying code extends addressing mode. VHDL procedure dynamically opens a file . Configure buck converter for boost operation. Circuit eases three-phase monitoring. PLL forms simple MSK demodulator. C makes inexpensive sine-wave generator. 74...

Simple BER meter is easy to build: 03/02/00 EDN-Design Ideas / 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 performance similar to that of a...

Single sideband demodulator covers the HF band: 07/20/00 EDN-Design Ideas / The circuit in Figure 1 complements a previous Design Idea ( Reference 1 ). The modulator used a phasing network to split a low-frequency (audio) signal into in-phase and quadrature (orthogonal) components. The phasing network has an advantage over...

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 network to split a low-frequency audio signal into in-phase and quadrature (orthogonal) compo...

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...





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