Title:
【発明の名称】デジタル-アナログ変換器
Document Type and Number:
Japanese Patent JP2554056
Kind Code:
B2
Abstract:
A one-bit coded signal is converted into an analog signal by means of an integrator comprising an operational amplifier (1), whose output (4) is fed back to the inverting input (3) by means of a first capacitor (C1) and a resistor (R1). Depending on the value of the one-bit coded signal a positive current pulse or a negative current pulse is applied to the inverting input (3) of the integrator. The positive current pulses are generated by means of a switching network (10) comprising a second capacitor (C3) which is switched by means of a plurality of switches (S1 to S4). The negative current pulses are generated by means of a switching network (20) comprising a third capacitor (C4) which is switched by a plurality of further switches (S6 to S8). In order to ensure that the analog output signal is not distorted as a result of the positive and negative current pulses, a fourth capacitor (C2) is connected to the inverting input (3) of the integrator, which fourth capacitor has a higher capacitance than each of the other capacitors (C1, C3, C4).
Inventors:
AISE KARERU DEEIKUMANSU
Application Number:
JP15395586A
Publication Date:
November 13, 1996
Filing Date:
June 30, 1986
Export Citation:
Assignee:
FUIRITSUPUSU EREKUTORONIKUSU NV
International Classes:
H03M1/10; H03M1/00; H03M1/66; H03M3/02; (IPC1-7): H03M1/66; H03M3/02
Domestic Patent References:
| JP6070327A | ||||
| JP5164853A | ||||
| JP5923616A | ||||
| JP6061818U |
Attorney, Agent or Firm:
Akihide Sugimura (1 outside)