Two Simple Analog Multiplier Based Linear VCOs Using a Single Current Feedback Op-Amp

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Provided by: Scientific Research Publishing
Topic: Hardware
Format: PDF
Although a number of new building blocks and circuit concepts related to current-mode circuits have been investigated in recent literature, the use of Current Feedback Operational Amplifiers (CFOAs) as an alternative to the traditional Voltage-mode Op-Amps (VOA), has attracted considerable attention in various instrumentation, signal processing and signal generation applications due to their commercial availability as off-the-shelf ICs as well as due to the well-known advantages offered by CFOAs over the VOAs. Two simple Voltage-Controlled-Oscillators (VCO) with linear tuning laws employing only a single Current Feedback Operational Amplifier (CFOA) in conjunction with two Analog Multipliers (AM) have been highlighted. The workability of the presented VCOs has been demonstrated by experimental results based upon AD844 type CFOAs and AD534 type AMs.
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