CA2419936A1 - Circuit for producing low-voltage differential signals - Google Patents

Circuit for producing low-voltage differential signals Download PDF

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Publication number
CA2419936A1
CA2419936A1 CA002419936A CA2419936A CA2419936A1 CA 2419936 A1 CA2419936 A1 CA 2419936A1 CA 002419936 A CA002419936 A CA 002419936A CA 2419936 A CA2419936 A CA 2419936A CA 2419936 A1 CA2419936 A1 CA 2419936A1
Authority
CA
Canada
Prior art keywords
differential
amplifier
output
input
predriver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002419936A
Other languages
French (fr)
Other versions
CA2419936C (en
Inventor
Atul V. Ghia
Suresh M. Menon
David P. Schultz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xilinx Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2419936A1 publication Critical patent/CA2419936A1/en
Application granted granted Critical
Publication of CA2419936C publication Critical patent/CA2419936C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/0175—Coupling arrangements; Interface arrangements
    • H03K19/0185—Coupling arrangements; Interface arrangements using field effect transistors only
    • H03K19/018507—Interface arrangements
    • H03K19/018521—Interface arrangements of complementary type, e.g. CMOS
    • H03K19/018528—Interface arrangements of complementary type, e.g. CMOS with at least one differential stage
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/15—Arrangements in which pulses are delivered at different times at several outputs, i.e. pulse distributors
    • H03K5/151—Arrangements in which pulses are delivered at different times at several outputs, i.e. pulse distributors with two complementary outputs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/028—Arrangements specific to the transmitter end

Abstract

Described are systems for producing differential logic signals. These systems can be adapted for use with different loads by programming one or more programmable elements. One embodiment includes a series of driver stages, the outputs of which are connected to one another. The driver stages turn on successively to provide increasingly powerful differential amplification. This progressive increase in amplification produces a corresponding progressive decrease in output resistance, which reduces the noise associated with signal reflection. The systems can be incorporated into programmable IOBs to enable PLDs to provide differential output signals.

Claims (8)

1. A differential amplifier comprising:
a. a first differential-amplifier stage having:
i. first and second differential input terminals adapted to receive a differential input signal; and ii. first and second differential output terminals;
b. a second differential-amplifier stage having:
i. third and fourth differential input terminals adapted to receive the differential input signal;
ii, third and fourth differential output terminals connected to the first and second differential output terminals; and iii. an amplifier-enable terminal; and c. a programmable memory cell capable of maintaining a programmed state and a deprogrammed state, the memory cell having a memory-cell output terminal connected to the amplifier-enable terminal;
d, wherein the second differential amplifier stage amplifies the input signal when the memory cell is in the programmed state and does not amplify the input signal when the memory cell is in the deprogrammed state.
2. The differential amplifier of claim 1, further comprising a predriver having:
a. a data input terminal adapted to receive an input data signal; and b. first and second complementary output terminals connected to respective ones of the first and second differential input terminals.
3. The differential amplifier of claim 2, wherein the predriver further comprises:
a. a first tri-state buffer having a first tri-state input terminal connected to the data input terminal;
b. a second tri-state buffer having a second tri-state input terminal connected to the data input terminal;
c. an inverter having an inverter input terminal connected to the data input terminal and an inverter output terminal connected to the first complementary output terminal; and d. a non-inverting delay stage having a delay-stage input terminal connected to the data input terminal and a delay-stage output terminal connected to the second complementary output terminal.
4, The differential amplifier of claim 1, further comprising a programmable termination load connected between the first and second differential output terminals.
5. A programmable logic device comprising:
a. a predriver having:
i. a data input terminal adapted to receive an input data signal; and ii. complementary first and second predriver output terminals;
b. first and second input/output pins adapted to convey signals from the programmable logic device;
c. a first programmable output block including a first differential amplifier, the first differential amplifier having a first differential-amplifier input terminal connected to the first predriver output terminal, a second differential-amplifier input terminal connected to the second predriver output terminal, and a first differential-amplifier output terminal connected to the first input/output pin; and d. a second programmable output block including a second differential amplifier, the second differential amplifier having a third differential-amplifier input terminal connected to the first predriver output terminal and a fourth differential-amplifier input terminal connected to the second predriver output terminal, and a second differential-amplifier output terminal connected to the second input/output pin.
6. The programmable logic device of claim 5, wherein the first pin is adjacent the second pin.
7. The programmable logic device of claim 5, further comprising:

a. an enable terminal connected to at least one of the predriver and the first and second programmable output blocks; and b. a programmable memory cell connected to the enable terminal.
8. The programmable logic device of claim 5, further comprising a termination load connected between the first and second input/output pins.
CA2419936A 2000-09-05 2001-08-31 Circuit for producing low-voltage differential signals Expired - Lifetime CA2419936C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/655,168 2000-09-05
US09/655,168 US6366128B1 (en) 2000-09-05 2000-09-05 Circuit for producing low-voltage differential signals
PCT/US2001/027233 WO2002021684A2 (en) 2000-09-05 2001-08-31 Circuit for producing low-voltage differential signals

Publications (2)

Publication Number Publication Date
CA2419936A1 true CA2419936A1 (en) 2002-03-14
CA2419936C CA2419936C (en) 2012-10-16

Family

ID=24627795

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2419936A Expired - Lifetime CA2419936C (en) 2000-09-05 2001-08-31 Circuit for producing low-voltage differential signals

Country Status (6)

Country Link
US (2) US6366128B1 (en)
EP (1) EP1316146B1 (en)
JP (1) JP5016176B2 (en)
CA (1) CA2419936C (en)
DE (1) DE1316146T1 (en)
WO (1) WO2002021684A2 (en)

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Also Published As

Publication number Publication date
JP2004508761A (en) 2004-03-18
US6366128B1 (en) 2002-04-02
US6531892B2 (en) 2003-03-11
CA2419936C (en) 2012-10-16
WO2002021684A3 (en) 2003-02-27
JP5016176B2 (en) 2012-09-05
EP1316146A2 (en) 2003-06-04
US20020060602A1 (en) 2002-05-23
WO2002021684A2 (en) 2002-03-14
DE1316146T1 (en) 2003-11-27
EP1316146B1 (en) 2013-01-23

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Effective date: 20210831