Sampled data-biasing of continuous time integrated circuit

Details Sampled data-biasing of continuous time integrated circuit Sampled data-biasing of continuous time integrated circuit

1995-09-29

1997-04-15

Mottola, Steven

Amplifiers

Signal feedback

Phase shift means in loop path

327554, H03F 134

Patent

active

056213557

ABSTRACT:
Process-dependent characteristics of a continuous time circuit, e.g., particular the sensitivity of the corner frequency of a continuous time filter to variations in absolute capacitance, is obviated by modifying a resistance-based transconductance tuning circuit, so that the tuning resistor is replaced with a switched capacitor circuit. The effect of this switched sampled data resistor replacement is such that, if each of the resistor-simulating switched capacitor of the transconductance stage and one or more load capacitors of the filter is established in the same processing sequence, what would otherwise be process-sensitive terms in the corner frequency-establishing ratio (g.sub.m /C) effectively cancel each other, so that the corner frequency fhi becomes proportional to a readily controlled frequency parameter for the sampled data resistor.

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