High-accuracy complementary metal oxide semiconductor (CMOS) single-end-input to differential-output converter

A single-ended input and differential output technology, which is applied in differential amplifiers, code conversion, analog/digital conversion, etc., can solve the problem of output signal amplitude and phase deviation from differential signals, etc.

Inactive Publication Date: 2012-04-04
孙茂友
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Since R3 is not infinite, and the resistance of C3 is very small at high frequencies, the common-mode output signal VIN / 2 is not infinitely suppressed when outputting OUTB. In this way, the common-mode output signal amplified by the differential amplifier is mixed with the differential signal, resulting in The amplitude and phase of the output signal deviate from the differential signal

Method used

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  • High-accuracy complementary metal oxide semiconductor (CMOS) single-end-input to differential-output converter
  • High-accuracy complementary metal oxide semiconductor (CMOS) single-end-input to differential-output converter
  • High-accuracy complementary metal oxide semiconductor (CMOS) single-end-input to differential-output converter

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Embodiment Construction

[0013] The invention consists of a load resistor R1, a bias resistor RB1, MOS transistors M1-M8, and a feedback coupling resistor RF. Compare the common-mode output signal of the differential amplifier with a reference common-mode bias voltage. If the common-mode output signal deviates from the reference value, a feedback signal will be generated to adjust the differential amplifier bias current M3 so that the common-mode output returns to the reference value. In this way, the common-mode output signal is effectively controlled. In addition, for differential input signals, the sources of the differential amplifiers M1 and M2 are equivalent to ground, so the feedback loop has no effect on the differential signal. In this way, the present invention effectively converts the single-ended input signal into a differential output signal, and the output differential signal has a phase difference of less than 0.02 degrees and an amplitude difference of less than 0.01 DB.

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Abstract

The invention discloses a high-accuracy complementary metal oxide semiconductor (CMOS) single-end-input to differential-output converter. As a figure (5) shows, the high-accuracy CMOS single-end-input to differential-output converter consists of a load resistor R1, a bias resistor RB1, metal oxide semiconductor (MOS) transistors M1 to M8, and a coupling resistor RF. The high-accuracy CMOS single-end-input to differential-output converter is characterized in that: a common mode output signal is compared with a reference common mode bias voltage; and if the common mode output signal is not equal to a reference value, a feedback loop can be generated for adjusting a bias current M3 of a differential amplifier to make the common mode output signal equal to the reference value, so that the common mode output signal can be effectively controlled.

Description

Technical field [0001] The invention relates to a commonly used single-ended input to differential output converter in integrated circuits, in particular to a high-precision CMOS single-ended input to differential output signal converter. Background technique [0002] Integrated circuits often use single-ended input signals to be converted into differential signal outputs by converters, as shown in Figure (1). The existing single-ended input to differential output conversion technology is: a pair of NMOS transistors M1 and M2 form a differential amplifier, and two The same resistor R1 is coupled from the drains of the tubes M1 and M2 to the voltage source VCC, the gates of M1 and M2 are connected to the DC bias voltage VBIAS1 through a pair of resistors RB1, the gate of M2 is also grounded through the capacitor C2R, and the single-ended input signal is through the capacitor C1 is coupled to the gate of M1, and M3 controls the working current of M1 and M2. Due to the parasitic cap...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03M1/34
Inventor 孙茂友
Owner 孙茂友
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