Master tuning circuit for adjusting a slave transistor to follow

Details Master tuning circuit for adjusting a slave transistor to follow Master tuning circuit for adjusting a slave transistor to follow

1999-03-09

2000-10-31

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Nonlinear amplifying circuit

327538, 330282, G06G 726

Patent

active

061408689

ABSTRACT:
A method and apparatus for adjusting the resistance across a slave transistor to follow a master resistor network are disclosed. A tuning circuit is disclosed which is used to control the effective resistance of a slave transistor for use in high speed integrated automatic gain control, equalizer, filter or equivalent types of circuits where low parasitic capacitance is desired. The invention provides a way to replace a resistor network and its associated high parasitic capacitance with an equivalent resistance having low parasitic capacitance. The invention replaces the resistor network, having large parasitic capacitance, with a slave transistor exhibiting an equivalent resistance, having low parasitic capacitance. An automatic tuning circuit containing a resistor network is located remotely to a circuit containing a slave transistor. The tuning circuit is then used to adjust the effective resistance of the slave transistor. The invention decreases unwanted parasitic capacitance, resulting in higher speed integrated automatic gain control, equalizer, filter and equivalent types of circuits.

REFERENCES:
patent: 5651073 (1997-07-01), Isu et al.
patent: 5973551 (1999-10-01), Mitsuda

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