Wide-range-digitally-controlled-variable-gain-amplifier


Posted on Dec 22, 2012

The circuit uses the LTC1043 in a variable gain amplifier which features continuously variable gain, gain stability of 20 ppm/°C, and single-ended or differential inputs. The circuit uses two separate LTC1043s. LTC1043B is continuously clocked by a 1-kHz source, which could also be processor supplied. Both LTC1043s function as the sampled data equivalent of a resistor within the bandwidth set by Al`s 0.01-I`F value and the switched-capacitor equivalent feedback resistor.


Wide-range-digitally-controlled-variable-gain-amplifier
Click here to download the full size of the above Circuit.

The time-averaged current delivered to the summing point by LTC1043A is a function of the 0.01-I"F capacitor"s input-derived voltage and the commutation frequency at pin 16. Low-commutation frequencies result in small time-averaged current values, and require a large input resistor. Higher frequencies require an equivalent small input resistor.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

the design of the walkie cardiotachometer of MSP430
circuit transistor tester
Battery charger circuit using SCR
Simple combination lock
Digital Circuits
Spectrum monitor with memory function circuit
Vanda F9500 servo power



Top