Simple-low-cost-rf-switch


Posted on Jul 19, 2012

When the digital logic level at the control input is low, the PIN diode is forward-biased by the CMOS gates. The two 1-KO bias resistors limit this current to the PIN diode`s safe forward current limit. In this state, the switch is on. When the control input is high, the diode is reverse-biased and the switch is ~ott. This switch is well-suited for electronically steered antenna arrays, multiple path switching, and other applications requiring small, low-cost rf switches.


Simple-low-cost-rf-switch
Click here to download the full size of the above Circuit.

This particular design was used in a four-pole rotary switch for a Doppler-shift radio direction-finder operating at 144 MHz.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Precision-one-shot
Differential-instrumentation-amplifier
Proximity Detector
Sound-Operated Switch
6 Digit Coded Ac Power Switch Circuit
Serial Voltmeter using the PIC16C71
Battery charger circuit using L200
VU Meter using LM3915
Two-Zone Burglar Alarm
Road remote control switch production
CM8888 CMOS INTEGRATED DTMF TRANCEIVER



Top