Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1987-12-15
1988-12-13
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307451, 307475, 307362, H03K 1730
Patent
active
047913185
ABSTRACT:
A circuit for controlling the circuit thresholds on an MOS integrated circuit takes advantage of the fact that all MOS devices of a particular type on the same chip have nearly identical characteristics. The circuit thresholds are varied by applying a control voltage to the back gate of an MOS device in each stage to be controlled. The control voltage is generated in a reference stage which utilizes a feedback loop to servo the back gate voltage of an MOS transistor in the loop. A reference voltage equal to the desired circuit threshold votlage is applied to the input of the reference stage. The reference voltage and the reference stage output are applied to an amplifier in the feedback loop. The amplifier applies to the back gate of the MOS transistor in the reference stage a control voltage that tends to equalize or establish a desired offset between the reference voltage and the reference stage output. The control voltage applied to the reference stage back gate is coupled to the back gate of the MOS transistor in each operating stage. The threshold control circuit is particularly useful in CMOS circuits, but can be utilized in any MOS circuit having an MOS transistor with an accessible back gate.
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Frantz, "Threshold Voltage Control for N-Channel MOSFET Devices", IBM T.D.B., vol. 12, No. 12, May 1970, p. 2078.
Chang, "FET N-Channel Threshold Voltage-Control Circuit", IBM T.D.B., vol. 17, No. 1, Jun. 1974, p. 140.
Lefton Scott
Lewis Stephen R.
Analog Devices Inc.
Hudspeth D. R.
Miller Stanley D.
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