Abstract
Transconductance amplifier capacitor oscillators (TACOs) readily produce phase-shifted sinusoids with low distortion over a wide frequency range. Hence, TACOs can be used in applications including telecommunications and lock-in amplifiers. The precise amplitude regulation needed in such applications necessitates an automatic gain controller (AGC) with an envelope detector. TACOs and envelope detectors have frequency-dependent nonidealities which complicate AGC design and incite amplitude modulation outside a limited frequency range. This work presents a VCO with an AGC that uses maxima sampling to compensate for envelope detector nonidealities. The VCO, which is evaluated using a field-programmable analog array, is tunable from 30 Hz to 40 kHz and consumes ≤50 μW.
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