AC bypass circuit which provides stabilization of high frequency

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage

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327531, 327532, 327384, 327310, 327558, 326 33, H03K 1716

Patent

active

057010986

ABSTRACT:
An integrated circuit includes a semiconductor die and electronic circuitry elements formed therein. First and second internal power supply lines transmit first and second supply voltages to provide power for the circuitry elements. The die includes bypass circuitry to inhibit variations in the supply voltages. The bypass circuitry includes transconductance circuitry, characterized by a variable conductivity, having a first flow electrode coupled to the first supply line, a second flow electrode coupled to the second supply line, and a control electrode for controlling current flow between the flow electrodes. The conductivity of the transconductance circuitry varies in response to a voltage difference between the control electrode and the second flow electrode. Voltage amplifier circuitry has a first input terminal coupled to the first supply line and a second input terminal coupled to the second supply line. The voltage amplifier circuitry amplifies a voltage difference between the first supply line and the second supply line. The amplified voltage difference is provided at an output terminal. Capacitive coupling circuitry couples the output terminal of the voltage amplifier circuitry to the control terminal of the transconductance circuitry. Feedback circuitry couples the first flow electrode of the transconductance circuitry to the input terminal of the voltage amplifier circuitry. Preferably, the transconductance circuitry has a high input impedance seen by the voltage amplifier circuitry, which reduces the capacitance value of the capacitative coupling required to pass an AC signal unattenuated from the output of the voltage amplifier circuitry to the control electrode of the transconductance circuitry.

REFERENCES:
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patent: 4709159 (1987-11-01), Pace
patent: 4894567 (1990-01-01), Lenk
patent: 5049764 (1991-09-01), Meyer
patent: 5179362 (1993-01-01), Okochi et al.
patent: 5327027 (1994-07-01), Taylor
patent: 5379003 (1995-01-01), Bizen
"Linear Technology", High Speed Amplifier Techniques, Jim Williams, Aug. 1991, Application Note No. 47, pp. AN47-1-4, An4711-12.
"Feedback Eliminates Switch Contact Transients", Veikko O. Jaakola, The Electronic Engineer, Jan. 1971, vol. 30, No. #1.

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