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Voltage adder circuit and D/A converter circuit

A voltage adder, amplifier circuit technology, used in digital-to-analog converters, amplifiers with semiconductor devices/discharge tubes, amplifiers, etc., can solve problems such as errors

Inactive Publication Date: 2011-06-22
YAMAHA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The input offset occurring in the operational amplifier OP1 adversely affects the voltage Vo obtained from the output terminal OUT of the operational amplifier OP1, which in turn introduces a gap between the actually obtained voltage value Vo and the ideal voltage value Vo represented by equation (1). error

Method used

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  • Voltage adder circuit and D/A converter circuit
  • Voltage adder circuit and D/A converter circuit
  • Voltage adder circuit and D/A converter circuit

Examples

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Embodiment Construction

[0026] Embodiments of the present invention will be described below with reference to the accompanying drawings.

[0027] figure 1 is a view showing the configuration of the voltage adder circuit 50 according to the embodiment of the present invention. The voltage adder circuit 50 performs weighted addition expressed by equation (1) on the voltages Va and Vb supplied from the previous stage circuit, and outputs a voltage Vo as a result of the weighted addition. The voltage adder circuit 50 includes two operational amplifiers OP1 and OP2 , two resistors ra and rb, and a current supply section 51 .

[0028] In the voltage adder circuit 50, the voltage Va is input to the non-inverting input terminal IN+ of the operational amplifier OP1, and the voltage Vb is input to the non-inverting input terminal IN+ of the operational amplifier OP2. The output terminal OUT of the operational amplifier OP1 and the output terminal OUT of the operational amplifier OP2 are connected through resi...

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PUM

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Abstract

A voltage adder circuit includes an amplifier circuit having a first operational amplifier and into which a first voltage is input, a circuit that supplies an output current to the amplifier circuit, and a current providing section that detects the output current of the circuit and supplies an output current equal to the output current of the circuit in magnitude so that the output current of the circuit is prevented from inputting to or outputting from the first operational amplifier through an output terminal of the first operational amplifier. A second voltage is input into the circuit.

Description

technical field [0001] The present invention relates to a voltage adder circuit for weighted addition of a plurality of input voltages and a D / A conversion circuit provided with the voltage adder circuit. Background technique [0002] In some D / A conversion circuits, input data to be converted is divided into high-order bits and low-order bits, and the high-order bits and low-order bits are separately subjected to D / A conversion. Each result of the D / A conversion is further weighted and added to obtain the final result of the D / A conversion. This type of D / A conversion circuit is described in, for example, JP-A-2001-156640. This D / A conversion circuit has two D / A converters and a voltage adder circuit. The two D / A converters perform D / A on the bit-inverted result (i.e., one's complement of the low-order 4 bits) of the high-order 4 bits and low-order 4 bits in the 8-bit input data convert. The voltage adder circuit performs weighted addition of the voltage Va and the volt...

Claims

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Application Information

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IPC IPC(8): H03M1/68H03F3/45
CPCH03F3/45475H03F3/45183H03F2203/45674H03F2203/45138
Inventor 辻信昭前岛利夫
Owner YAMAHA CORP
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