Fully differential operational amplifier circuit for eliminating direct-current offset voltage
A technology of operational amplifiers and DC offsets, applied in differential amplifiers, DC-coupled DC amplifiers, amplifiers, etc., can solve problems such as loop oscillation and high requirements for operational amplifiers, achieve simplified circuit structure, simple implementation methods, and improve system stability Effect
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Embodiment 1
[0032] Such as Figure 4 Shown is the circuit diagram of the specific embodiment 1 of the present invention, that is, a fully differential operational amplifier circuit for eliminating DC voltage, and the fully differential operational amplifier structure is a two-stage operational amplifier circuit with differential input and differential output.
[0033] Among them, VIP and VIN are differential input signals, VOP and VON are differential output signals, VDCP and VDCN are DC offset signals, VDD is power supply, VB is bias voltage, vfb is feedback voltage, VREF is reference voltage, VCM is common mode Voltage.
[0034] The first-stage operational amplifier module 1 is composed of P-type MOS transistors (MP1), P-type MOS transistors (MP2), N-type MOS transistors (MN1), N-type MOS transistors (MN2) and N-type MOS transistors (MN6). Among them, MN1 and MN2 are differential input tubes, MP1 and MP2 are load tubes; MN6 is a tail current source, which provides operating current for...
Embodiment 2
[0041] Such as Figure 5 As shown, on the basis of the first embodiment, the DC offset signal differential amplifier 5 in the second embodiment consists of an N-type MOS transistor (MN3 1 -MN3 n ), N-type MOS tube (MN4 1 -MN4 n ) and n bit control switch S 31 -S 3n and S 41 -S 4n constitute. Programmable through the control signal to achieve the adjustment of the DC level suppression.
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