Posted on Apr 9, 2012

The first stage is a simple buffer used to isolate the signal source from the attenuator stages to follow. Each of the subsequent stages is preceded by a voltage divider formed by two resistors and CMOS switch. Provided that the CMOS switch for each stage is closed, the drive signal will be attenuated according to the basic voltage divider relationship at each stage. In the event a switch is open, nearly all of the signal strength will be passed to the next stage through the 1-K!l resistor. The amplifiers act as buffers for divider networks and reduce the interaction between stages.

Click here to download the full size of the above Circuit.

Eight levels of attenuation are possible with the circuit as illust..rated, but more stages could be added. Each divider network must be closely matched to the resistor ratios shown or the level of attenuation will not match the levels in the logic chart.

Leave Comment

characters left:

New Circuits



Popular Circuits

Bargrapk car voltmeter
Touch switch or proximity detector
1 Second Time Base From Crystal Oscillator
Sounds From The Old West
50w audio amplifier using ic tda1562
Light Related
DVI-300/2000 Load Step Response
3 Band Graphic Equalizer
RFID Readers for the HDX Protocol
pulse induction metal detector with DSP
Micro-power 32.768kHz clock oscillator circuit