Low noise DAC current source topology

Details Low noise DAC current source topology Low noise DAC current source topology

1990-03-19

1991-04-30

Beha, Jr., William H.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323312, 323315, 341153, G05F 330

Patent

active

050121782

ABSTRACT:
An electrical circuit (30) corrects for the presence of noise current and current drift in the currents developed by each current source transistor Q.sub.0, Q.sub.1, Q.sub.2, Q.sub.3, . . . Q.sub.n in a current source array. The electrical circuit corrects for the presence of noise current and current drift by simultaneously inducing in each current source correction currents whose values sum to cancel the current drift and noise. A noise suppression circuit includes an amplifier having an open loop gain, A.sub.v, which is configured to adjust the magnitudes of the multiple currents in response to the introduction of a noise current, i.sub..delta., in any one of the currents. The adjustment substantially cancels i.sub..delta. and thereby substantially reduces the presence of i.sub..delta. in the output current. The presence of i.sub..delta. in the output signal is substantially equal to i.sub..delta. /(1+A.sub.v).

REFERENCES:
patent: 3675114 (1972-07-01), Nercessian
patent: 4280091 (1981-07-01), Hiltner
patent: 4573005 (1986-02-01), van de Plassche
patent: 4712091 (1987-12-01), Schoofs et al.
patent: 4864216 (1989-09-01), Kalata et al.

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