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Differential drive circuit and communication device

A differential drive and circuit technology, applied in the direction of logic circuit, differential amplifier, logic circuit connection/interface layout, etc., can solve problems such as average voltage instability

Inactive Publication Date: 2011-09-28
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In this type of circuit, the average voltage across the load is not stable unless the average values ​​of the pull-up and pull-down currents match each other over an extended period of time

Method used

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  • Differential drive circuit and communication device
  • Differential drive circuit and communication device
  • Differential drive circuit and communication device

Examples

Experimental program
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Effect test

no. 1 example

[0060] figure 1 is a circuit diagram showing the structure of a driver including a differential drive circuit according to a first embodiment of the present invention.

[0061] The driver 1 according to this embodiment has a differential drive circuit 2 , a first digital-to-analog converter (DAC) 3 , a second DAC 4 and a common-mode feedback (CMFB) circuit 5 .

[0062] The differential drive circuit 2 has a PMOS transistor Q1 as a first field effect transistor of a first conductivity type such as a P-channel type (P-type) and a PMOS transistor Q2 as a P-type second field effect transistor.

[0063] The differential drive circuit 2 has an NMOS transistor Q3 as a third field effect transistor of a second conductivity type such as an N-channel type (N-type) and an NMOS transistor Q4 as an N-type fourth field effect transistor.

[0064] The source of the first transistor Q1 is connected to the power supply potential source VDD via the first resistor R1, and the drain is connected...

no. 2 example

[0132] figure 2 is a circuit diagram showing the structure of a driver including a differential drive circuit according to a second embodiment of the present invention.

[0133] figure 2 The driver 1A shown has the following with figure 1 The drive 1 difference in .

[0134] First, in the differential drive circuit 2A, the fifth resistor R5 is connected between the source of the first transistor Q1 and the source of the second transistor Q2, and the sixth resistor R6 is connected between the source of the third transistor Q3 and the source of the second transistor Q3. between the sources of four transistors Q4.

[0135] Second, a first differential amplifier 6 and a second differential amplifier 7 are provided instead of DAC3 and DAC4.

[0136] The first differential amplifier 6 receives the analog differential voltage to generate the first driving target voltage V1 and the second driving target voltage V2, provides the generated first driving target voltage V1 to the fi...

no. 3 example

[0175] image 3 is a schematic structural diagram of a communication device according to a third embodiment of the present invention.

[0176] image 3 The communication device 100 in has a driver in each of its transmitters, and the driver includes a differential driver circuit according to an embodiment of the present invention.

[0177] The communication device 100 has transmitters 120 and 130 respectively disposed on both sides of a differential transmission line 110 . The communication device is capable of two-way communication.

[0178] The transmitters 120 and 130 each have the above-described differential drive circuit 2 or 2A according to the first or second embodiment.

[0179] The communication device 100 has receivers 140 and 150 arranged in parallel with the transmitters 120 and 130 respectively with respect to the differential transmission line 110 .

[0180] The differential transmission line 110 is connected at either end to a terminating resistor Rterm.

...

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PUM

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Abstract

A differential drive circuit includes at least a first or second drive system. The first drive system has first and second field effect transistors, first and second resistors, and first and second circuits controlling the source voltages of the first and second field effect transistors to equal first and second drive target voltages, the first and second field effect transistors having sources connected to a power potential via the first and second resistors, respectively. The second drive system has third and fourth field effect transistors, third and fourth resistors, and third and fourth circuits controlling the source voltages of the third and fourth field effect transistors to equal third and fourth drive target voltages, the third and fourth field effect transistors having sources connected to a reference potential via the third and fourth resistors, respectively. A common-mode voltage is driven to form a constant differential signal across a load resistance.

Description

[0001] Cross References to Related Applications [0002] The present invention contains subject matter related to Japanese Patent Applications JP2007-311134 and JP2008-231338 filed with the Japan Patent Office on November 30, 2007 and September 9, 2008, the entire contents of which are incorporated in This is for reference. technical field [0003] The present invention relates to a differential drive circuit and a communication device for processing differential signals propagating on differential transmission lines or the like. Background technique [0004] Differential signaling is widely used for high-speed long-distance transmission of data. [0005] In particular, a push-pull driver described in Japanese Unexamined Patent Application Publication No. 2006-345259 is frequently used because the current required to drive a differential signal to a load is small. [0006] In this type of circuit, the average voltage across the load is not stable unless the average values ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H03K19/0185H03F3/45
CPCH03F3/45179H03F3/45224H03K19/018528H03K19/018585H03M1/0604H03M1/0682H03M1/745H04L25/0276H04L25/0282
Inventor 菊池秀和市村元小泽美穗
Owner SONY CORP
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