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Output signal circuit for use in a receiver

A signal output and receiver technology, which is applied in logic circuits, electrical components, and adjustment of electrical variables, can solve problems such as increased parasitic capacitance, degradation of output signal frequency characteristics, and decreased operating speed of transistors.

Active Publication Date: 2013-03-27
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the size is increased, the parasitic capacitance will inevitably increase, and the operating speed of the transistor will decrease.
As a result, the frequency characteristic of the output signal output from the signal output circuit may be degraded.

Method used

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  • Output signal circuit for use in a receiver
  • Output signal circuit for use in a receiver
  • Output signal circuit for use in a receiver

Examples

Experimental program
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Embodiment Construction

[0017] Embodiments will be further described below with reference to the drawings.

[0018] In the drawings, the same symbols represent the same or similar parts.

[0019] refer to figure 1 , and the first embodiment will be described.

[0020] figure 1 It is a circuit diagram showing the signal output circuit of the first embodiment.

[0021] The signal output circuit of this embodiment includes N-channel MOS transistors 1 and 2 and a back gate bias generator 3 . A constant gate voltage Vg is applied to the gate of the transistor 1 , and an input signal IN is input to the source of the transistor 1 . The gate of transistor 2 is connected to the drain of transistor 1 . The source of the transistor 2 is connected to the ground line GND via the current source I1 to be grounded. An output signal OUT is output from the source of the transistor 2 . The back gate bias generator 3 generates a common back gate bias voltage Vb to be applied to the back gates of the transistors 1...

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PUM

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Abstract

The invention provides an output signal circuit capable of preventing deterioration of frequency performance of an output signal even if the dynamic scope of the output signal is expanded. According to one embodiment, an output signal circuit for use in a receiver is provided. The output signal circuit is provided with first and second transistors of an insulated gate field effect type, and a backgate bias generator. A source of the first transistor is capable of receiving an input signal. A source of the second transistor is capable of generating an output signal. A backgate bias generator produces a backgate bias voltage which is applied to backgate of the first and second transistors commonly.

Description

[0001] This application is based on and claims priority from prior Japanese Patent Application No. 2011-200510 filed on September 14, 2011, the entire contents of which are incorporated herein by reference. technical field [0002] The embodiments described herein generally relate to a signal output circuit of a receiver. Background technique [0003] A mixer circuit that mixes a high-frequency reception signal (RF signal) and a local oscillator signal (LO signal) to output an intermediate frequency signal (IF signal) is used in a wireless communication receiver. As a mixer circuit using MOS transistors, a structure called a Gilbert cell is known. [0004] When outputting the IF signal output from such a mixing circuit to the outside, a signal output circuit is connected to the subsequent stage of the mixing circuit. When it is necessary to drive a load connected to the subsequent stage of the signal output circuit with low impedance, a source follower circuit with low outp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/094
CPCH03F2203/5033G05F3/02H03F1/483H03F3/193H03F2200/18H03F3/505
Inventor 林梅莲
Owner KK TOSHIBA