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Multiplier circuit

A multiplier and circuit technology, applied in logic circuits, electrical components, pulse technology, etc., can solve the problem that the gain is not constant

Active Publication Date: 2014-03-26
SHANGHAI BEILING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the gain of this type of existing current-mode multiplier is not constant, that is, it is approximately constant only when β is large enough

Method used

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Embodiment Construction

[0014] The multiplier circuit of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0015] figure 2 It is the circuit diagram of the multiplier of the present invention. like figure 2 As shown, the multiplier of the present invention includes three loops, a Gilbert cell current multiplier, a mirror loop and a compensation loop. The Gilbert unit multiplier used in this embodiment is a six-tube unit multiplier, that is, it has six NPN transistors T1 - T6 with exactly the same current gain.

[0016] The mirror circuit is connected to the two output current branches of the Gilbert unit current multiplier to mirror the two output currents to the compensation circuit. The mirror circuit includes four identical MOS transistors, the first MOS transistor MP1 and the second The MOS transistor MP2 is respectively connected to the two output current branches of the Gilbert unit current multiplier, and the...

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Abstract

The invention provides a multiplier circuit, which comprises a Gilbert unit current multiplier, a mirror image loop and a compensating loop, wherein the mirror image loop is connected to two paths of output current branches of the Gilbert unit current multiplier in order to mirror two paths of output current onto the compensating loop; the compensating loop comprises two transistors having the same gains as a transistor in the Gilbert unit current multiplier; the two transistors receive two paths of mirror image current obtained by the mirror image loop and outputs output current which is subjected to coefficient compensation for serving as the output current of the multiplier circuit. By using the multiplier circuit provided by the invention, constant current gain can be realized, is irrelevant to the current gain value beta of a triode, and is not influenced by the machining process, voltage and temperature of each transistor.

Description

technical field [0001] The invention relates to a multiplier circuit, in particular to a constant gain current type multiplier circuit. Background technique [0002] figure 1 It is the circuit diagram of Gilbert's six-tube unit current multiplier, which is a translinear multiplier composed of six transistors, and has the advantages of high precision and high speed. like figure 1 In the circuit diagram shown, the relationship between input and output current is expressed as: [0003] I o = α * I x * I y I A [0004] Here I x =I x1 -I x2 , I A =I x1 +I x2 , I y =I y1 -I y2 , I o =I o1 -I o2 . [0005] Among them α=β / (β+1), and β is the current amplification factor of the NPN type BJT transistor. Becau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/082H03K19/094
Inventor 陈方雄
Owner SHANGHAI BEILING