Low-noise voltage driving buffer
A voltage drive and buffer technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve the problems of transconductance Gm cannot be minimized, W/L cannot be small, etc., to reduce noise, reduce Small noise contribution, the effect of improving noise performance
Active Publication Date: 2021-06-15
苏州领慧立芯科技有限公司
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Problems solved by technology
Although the smaller the W / L of M4 and M5, the better, but due to the limitation of VGS5, the W / L cannot be too small, and the transconductance Gm of the equivalent load tubes M4 and M5 cannot be minimized
Method used
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[0049] figure 2 A connection diagram of a low noise voltage driven buffer according to the present invention is shown. image 3 Another schematic structural diagram of a low-noise voltage-driven buffer according to the present invention is shown.
[0050] combine figure 2 and image 3 As shown, the low-noise voltage drive buffer includes a bias current supply module 102, a first-stage amplification module 104, and a second-stage amplification module 106; the bias current supply module 102 is connected to the first-stage amplification module 104, which is the The first-stage amplification module 104 provides bias current; the first-stage amplification module 104 is respectively connected with the bias current supply module 102 and the second-stage amplification module 106, and amplifies the input signal and outputs an amplified signal; the second-stage amplification The module 106 is connected with the first-stage amplification module 104, and the second-stage amplificatio...
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The invention discloses a low-noise voltage driving buffer. The driving buffer comprises: a bias current providing module providing bias current for a first-stage amplifying module; the first-stage amplification module used for amplifying an input signal and outputting a signal after primary amplification; and a second-stage amplification module used for amplifying the signal subjected to primary amplification and outputting the signal subjected to secondary amplification. The first-stage amplification module comprises an input pair part and a load part, the input pair part is respectively connected with the load part and the second-stage amplification module, and the input pair part adopts a Native device; and the load part is respectively connected with the input pair part and the bias current providing module, and the bias current providing module provides bias current for the load part, so that the input pair part works in a saturation region or a sub-threshold region. The noise of the input pair and the load part is effectively reduced, the input pair part is prevented from entering a linear region, and the noise performance of the data converter is improved.
Description
technical field [0001] The invention belongs to the field of electronic equipment, and more specifically relates to a low-noise voltage drive buffer. Background technique [0002] Low-noise voltage reference buffers are often used in circuit design, and are mainly used to drive analog-to-digital converters (ADC), digital-to-analog converters (DAC), etc. Its noise directly determines the noise level of the converter. In high-precision and low-power applications, such as brainwave electrocardiogram detection, etc., there are relatively high requirements on the power consumption noise of the reference source. There are different implementations of the reference source buffer, such as figure 1 Shown is an implementation, which is essentially a voltage amplifier. Input VIN, output VOUT=VIN(1+R2 / R1). [0003] figure 1 The realization method in is relatively simple, and the cost is low, and the main disadvantage is that the noise source is relatively high. The noise of the am...
Claims
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CPCG05F3/26
Inventor 卢立柱
Owner 苏州领慧立芯科技有限公司