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Demodulator Circuits
Last Updated on:
Monday, October 03, 2011 06:07 PM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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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 ..... [Design
Idea by Luis Miguel Brugarolas, Sire Sistemas y Redes Telmaticas, Tres
Cantos, Madrid, Spain] |
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Circuit yields accurate absolute values - 5-Jul-01 Issue of EDN
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..... [Design Idea by Marco Pisani, Istituto di
Metrologia G Colonnetti, Turin, Italy] |
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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.....PDF Contains many designs, scroll to find this one.....
[Design Idea by Luis Miguel Brugarolas, SIRE, Madrid, Spain] |
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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 ..... |
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Experimental 1 kHz Synchronous Demodulator - This circuit employs a
synchronous demodulator to separate a 1 KHz signal from noise and measures
the 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..... |
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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. Silicon diodes have an offset
of approximately 0.6V and do not work well….PDF contains multiple circuits, scroll
to find the one of interest..... [Design Idea by Art Hogrefe, Puma
Instrumentation, State College, PA] |
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Novel idea implements low-cost keyboard - 3-Apr-03 Issue of EDN
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..... [Design Idea by Jean-Jacques Thevenin,
Thomson Plasma, Moirans, France] |
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Novel Method Detects Lock in Costas Loops - 22-Jun-00 Issue of EDN
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. …. [Design Idea by MR Raghavendra, ISRO Satellite Centre,
Bangalore, India] |
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Self-modifying code extends addressing-mode - 12/17/98 Issue of EDN
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 µC from 8 bits, or 256 locations, to the full 13-bit
(8-kbyte) memory address space.....Page includes several designs. Scroll to
find this one..... [Design Idea by Paul Sofianos, Motorola Inc, Tempe, AZ] |
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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..... [Design Idea by Luis Miguel Brugarolas, Sire Sistemas y
Redes Telmaticas, Tres Cantos, Madrid, Spain] |
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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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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..... EDN is migrating links. This link is not verified.
Google the "title" EDN for new link. |
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