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High-speed complementary type dual-power operational amplifier

An operational amplifier, dual power supply technology, applied in electrical components, analog-to-digital converters, code conversion, etc., can solve problems such as limiting the overall performance of the ADC, reducing the setup and hold time, and failing to meet application requirements.

Inactive Publication Date: 2019-09-10
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing solutions usually use a time domain interleaving structure to improve the overall ADC speed, but ADCs with this structure usually introduce mismatches such as offset, gain, timing, bandwidth, etc. These mismatches limit the overall performance of the ADC
[0003] In summary, the existing operational amplifiers reduce the setup and hold time while also limiting the overall performance of the ADC, which cannot meet the current application requirements.

Method used

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  • High-speed complementary type dual-power operational amplifier
  • High-speed complementary type dual-power operational amplifier
  • High-speed complementary type dual-power operational amplifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] See figure 1 , figure 1 It is a block diagram schematic diagram of a high-speed complementary dual-supply operational amplifier provided by an embodiment of the present invention, including a differential input terminal, a push-pull inverting amplifier circuit, and a cascode amplifier circuit; the differential input terminal and the push-pull inverting amplifier circuit The differential input terminal is connected; the output terminal of the push-pull inverting amplifier circuit is connected with the gain-enhancing sleeve type cascode amplifier circuit.

[0064] In one implementation, the push-pull inverting amplifier circuit includes: PMOS transistor P1, PMOS transistor P2, NMOS transistor N1, NMOS transistor N2, and power supply terminal VDD; the first differential signal Vin_N is input to the PMOS transistor P1 and the NMOS transistor through the differential input terminal The gate of N1, the second differential signal Vin_P is input to the gates of PMOS transistor...

Embodiment 2

[0070] like Figure 4 , Figure 5 As shown, the application of auxiliary operational amplifier AMP_N and auxiliary operational amplifier AMP_P increases the gate-source voltage Vgs of NMOS transistor N5, NMOS transistor N6, PMOS transistor P6, and PMOS transistor P7, which increases the output impedance and the gain. The auxiliary operational amplifier circuit is used in the gain-enhancing telescopic cascode amplifier circuit, so that the entire operational amplifier circuit can obtain the maximum bandwidth, so that the operational amplifier circuit can be used in high-speed amplifier circuits.

Embodiment 3

[0072] See Image 6 , Image 6 It is a circuit diagram of another high-speed complementary dual-supply operational amplifier provided by the embodiment of the present invention. The differential signal amplified by the push-pull inverting amplifier circuit is transmitted to the gain-improved telescopic cascode amplifier circuit, and the gain-improved type In the telescopic cascode amplifier circuit, a resistor is connected in series between the bias voltage input terminal Vbias and the PMOS transistor P4, and a capacitor C1 is connected in series between the gate of the PMOS transistor P4 and the gate of the NMOS transistor N3. The differential signal amplified by the push-pull inverting amplifier circuit is input through the differential input terminal of the gain-enhancing sleeve type cascode amplifier circuit. When the amplified voltage signal is output from the output terminal Vout1_N of the push-pull inverting amplifier circuit and When the terminal Vout1_P is sent to th...

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PUM

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Abstract

The invention discloses a high-speed complementary type dual-power operational amplifier, which comprises a differential input end, a push-pull inverting amplification circuit and a cascode amplification circuit. The differential input end is connected with the differential input end of the push-pull inverting amplification circuit; and the output end of the push-pull inverting amplification circuit is connected with the signal input end of the cascode amplification circuit. According to the invention, a two-stage operational amplifier with differential input and differential output is adopted. The operational amplifier comprises a push-pull inverting amplification circuit and a cascode amplification circuit, a differential signal sequentially passes through the push-pull inverting amplification circuit and the cascode amplification circuit, so that the operational amplifier can improve the swing amplitude of an output signal, and has the beneficial effects of high speed, larger bandwidth, shorter establishment time and shorter retention time.

Description

technical field [0001] The invention belongs to the field of integrated circuits, and in particular relates to a high-speed complementary dual-power supply operational amplifier. Background technique [0002] The operational amplifier is a key module of a high-speed and high-precision pipeline ADC, and the setup and hold time of the operational amplifier is also one of the important parameters of the operational amplifier. For the sample-and-hold circuit, the setup time is particularly important. With the improvement of the sampling speed of the pipeline ADC, Especially after video (Radio Frequency, referred to as RF) sampling, the requirement on the settling time of the operational amplifier has been shortened to ps level, which brings serious challenges to the designers of the operational amplifier. Existing solutions usually use a time-domain interleaving structure to increase the overall ADC speed, but ADCs with this structure usually introduce mismatches such as offset,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
CPCH03M1/1245
Inventor 刘马良李志航刘海珠朱樟明杨银堂
Owner XIDIAN UNIV
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