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« Hans' Nixie clock takes a step back in time | Main | Thermal management for a frosty office atmosphere »

Circuit Design Idea - Low-cost circuit incorporates mixing and amplifying functions

circuit mixing amplifier.jpg

Check out another newly-uploaded Design Idea designed to give circuit building inspiration.

It covers frequency-conversion, and optimising the mixer function with the amplifier, with two resistors in the feedback loop setting the voltage-conversion gain.

The Design Idea begins:
In many applications, the frequency-conversion steps comprise a buffer, preferably with some extra voltage gain; a mixer; and some filtering. Instead of including an amplifier in front of the mixer, you can easily integrate the mixer function with the amplifier.
A low-cost implementation uses an amplifier with a power-down-disable feature. When a square-wave local oscillator drives the disable pin, a square wave at the oscillator's frequency multiplies the input signal, and frequency conversion takes place.
Read the full Circuit Design Idea

It is courtesy of Guus Colman, Guy Torfs, Johan Bauwelinck, and Jan Vandewege of INTEC/IMEC, Ghent University (Edited by Martin Rowe and Fran Granville of EDN).

View all the Design Ideas on Electronics Weekly

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Posted by Alun Williams on July 23, 2008 11:18 AM | |

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