|
|
|
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] |
|
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] |
|
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] |
|
|
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 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..... |
|
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] |
|
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] |
|
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] |
|
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] |
|
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] |
|
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] |
|
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.
|
|
