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Cellular Phone Helper - When your cellular phone receives a call, it
begins transmitting even before you answer. The circuit shown in fig.1 detects
this signal and can operate a variety of devices referred to as
"load"….(circuit / design added 8/03)
Electronic Eavesdropping Devices Detector - Copyright of this circuit
belongs to smart kit electronics. In this page we will use this circuit to
discuss for improvements and we will introduce some changes based on original
schematic…..(design idea circuit added 09/08)
High impedance FET probe extends RF Spectrum analyzer's usable range - 02/05/2004
EDN-Design Ideas In low-noise analog circuits, a high-gain amplifier serves at
the input to increase the SNR. The input signal level determines the input-stage gain;
low-level signals require the highest gain. It is also standard practice in low-noise
analog-signal processing to make the circuit's bandwidth as narrow as possible to pass
only the useful input-signal spectrum. (added 3/06)
Improving Temperature, Stability, and Linearity of
High Dynamic Range RMS RF Power Detectors - AN-653 Analog Devices Application Notes
(app note added 3/06)
Input Filter Prevents Instrumentation Amp RF Rectification Errors - 11/13/03 EDN
Design Ideas / (added 1/05) Instrumentation amplifiers serve in a
variety of applications that need to extract a weak differential signal from large
common-mode noise or interference. However, designers often overlook the potential
problem of RF rectification inside the instrumentation amplifier. The amplifier's
common-mode rejection normally greatly reduces common-mode signals at an
instrumentation amplifier's input....
