Voltage-switching d/a converter using p- and n-channel MOSFETs

Details Voltage-switching d/a converter using p- and n-channel MOSFETs Voltage-switching d/a converter using p- and n-channel MOSFETs

1989-07-27

1991-12-24

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

341154, 307577, H03M 166

Patent

active

050756770

ABSTRACT:
In a voltage-switching digital-to-analog converter, each bit is switched by a switching circuit which uses a p-channel MOSFET as a V.sub.ref switch and an n-channel MOSFET as an Agnd switch, with a control circuit for controlling the signal applied to the gate of one of the devices (e.g., the n-channel device) to cause its "ON" resistance to match the "ON" resistance of the other device (e.g., the p-channel device). The control circuit includes reference n-channel and p-channel devices. A control signal is developed to drive the reference n-channel device to a condition wherein its drain current and drain-source voltage match those of the reference p-channel device, thereby causing their R.sub.ON s to match. The drive signal is taken as the output of the control means and is used to power the driver for the n-channel Agnd switches.

REFERENCES:
patent: 4558242 (1985-12-01), Tuthill et al.
patent: 4800365 (1989-01-01), White et al.

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