Plural stage switched capacitor integrating digital-to-analog co

Details Plural stage switched capacitor integrating digital-to-analog co Plural stage switched capacitor integrating digital-to-analog co

1988-04-05

1989-10-03

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341153, 341154, 341144, 341126, H03M 176, H03M 180

Patent

active

048720119

ABSTRACT:
A digital-to-analog converter for converting a digital signal having a word length n into an analog signal. The converter includes at least two switched capacitor integrators (1, 2) arranged in series and a control unit (18) for applying control signals to the integrators which perform an integration step under the influence of the control signal. Each integrator is provided with a capacitor network (11, 12) having at least two capacitors (27.1, 27.2, . . . ; 28.1, 28.2, . . . ) coupled between the input (13; 4) of the integrator and the inverting input (-) of an associated amplifier stage (5; 6). A capacitor (9; 10) is coupled between the inverting input (-) and the output (7; 8) of this amplifier stage. The control unit is adapted to apply, in this order, a first control signal to the first integrator (1), a second control signal to the second integrator (2), a third control signal to the first integrator and a fourth control signal to the second integrator. The first integrator couples a total capacitance of M1.Cref1 and M3.Cref1 during a given time interval to the inverting input of the amplifier stage (5) under the influence of the first and the third control signal, respectively. The second integrator (2) couples a total capacitance of M2.Cref2 and M4.Cref2 during a given time interval to the inverting output of the amplifier stage (6) under the influence of the second and the fourth control signal, respectively. For converting an arbitrary n-bit digital signal, M2+M4 is equal to a constant (k) which is preferably equal to 2.sup.p in which p.ltoreq.n an offset voltage which is independent of the value of the digital signal to be converted is produced at the output (8) of the converter.

REFERENCES:
patent: 4077035 (1978-02-01), Yee
patent: 4213120 (1980-07-01), Buchanan
patent: 4468654 (1984-08-01), Kapral
patent: 4584568 (1986-04-01), Zomorrodi
patent: 4611195 (1986-09-01), Shosaku
patent: 4661802 (1987-04-01), Yukawa
patent: 4665380 (1987-05-01), Lewyn
patent: 4667179 (1987-05-01), Law et al.
patent: 4799042 (1989-01-01), Confalonieri

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