Bipolar input circuit for CMOS flash analog to digital converter

Details Bipolar input circuit for CMOS flash analog to digital converter Bipolar input circuit for CMOS flash analog to digital converter

1988-03-03

1989-09-26

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

341172, H03M 100

Patent

active

048704180

ABSTRACT:
A CMOS analog to digital flash converter cell includes an input for receiving an analog signal to be converted to a digital value, a predetermined connection to a resistance ladder for providing a reference voltage, an output, CMOS comparator/inverter stage having drain connections commonly connected to the output, a level shift capacitor connected to input gate connections of the comparator/inverter stage, and three bi-phase clocked CMOS switches: a first switch for connecting the reference voltage to one side of the level shift capacitor during a first phase of a clock period; a second switch for connecting the output to the input gate connections on the other side of the level shift capacitor during the first phase of the clock period, and a third switch for connecting the input voltage to the one side of the level shift capacitor during a second phase of the clock period. The new input circuit includes a first bipolar transistor having a base connection to the predetermined resistance ladder connection and having an output node connected to the first CMOS switch and a second bipolar transistor having a base connection connected to the input and having an output node connected to the third CMOS switch.

REFERENCES:
patent: 4507649 (1985-03-01), Dingwall et al.
patent: 4641130 (1987-02-01), Mastroianni

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