Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1987-12-23
1988-10-11
Mullins, James B.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
307497, 328127, 330253, 330256, 330257, 330277, 330311, H03K 1320
Patent
active
047774720
ABSTRACT:
An input signal to an amplifier is coupled to a gate electrode of a first PMOS transistor operating as a common source inverting amplifier. The drain electrode of the first transistor is coupled to the source electrode of a second PMOS transistor via a junction terminal. An output signal is developed at the drain electrode of the second transistor. The junction terminal is coupled to a gate electrode of a third PMOS transistor, operating as a common source inverting amplifier. The drain electrode of the third transistor is coupled to the gate electrode of the second transistor for maintaining the drain voltage of the first transistor substantially constant when the input signal changes that maintains the output impedance at the drain electrode of the second transistor high.
REFERENCES:
patent: 3614645 (1971-10-01), Wheatley
patent: 4009475 (1977-02-01), DeFreitas
patent: 4550291 (1985-10-01), Millaway et al.
patent: 4625155 (1986-11-01), Dietz
A technical paper entitled THAM 11.5: A 120 KHZ Signal Delta A/D Converter, published in ISSCC Digest of Technical Papers, pp. 138-139; Feb., 1986, in the names of R. Koch, et al.
An article published in IEEE Transactions on Communication, vol. COM-33, No. 3, Mar. 1985, entitled, A Use of Double Integration in Sigma Delta Modulation, in the name of James C. Candy.
A textbook entitled, Switched Capacitor Circuits, in the names of Philip E. Allen and Edgar Sanchez-Sinencio, dated 1984, p. 94 and cover page.
An article published in IEEE Transactions on Circuits and Systems, vol. CAS.-25, No. 7, July 1978, entitled, A Sigma-Delta Modulator as an A/D Converter, in the name of Rudy J. VanDePlassche.
U.S. application Ser. No. 137,230, entitled A Switched Capacitor Arrangement, in the names of Donald Sauer and Todd Christopher that was filed concurrently herewith.
Christopher Todd J.
Sauer Donald J.
Henig Sammy S.
Laks Joseph J.
Mullins James B.
RCA Licensing Corporation
Whitacre Eugene M.
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