Voltage-to-current converter II

Posted on Sep 28, 2012

The circuit in Figure 1 performs active voltage-to-current conversion or acts as a variable-gain current mirror with high precision and bandwidth. A typical application is testing high-speed ICs or other devices that have inputs designed to be driven from current-steering DACs to enable a modulated voltage source to control the devices. The circuit thus simplifies the testing of such devices in isolation, because modulated voltage sources are readily available, but modulated current sources generally are not.

A further use of the circuit could be for easy and precise control of a current-controlled, variable-gain amplifier by using an adjustable dc voltage source at the input. Figure 1 shows the circuit configured as a voltage-to-current converter. The overall

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