Method for double sampling loop negative feedback and double sampling negative feedback amplifier
OwnerZongshan Zhouinventor
Life of this patent
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Abstract
A method for double sampling loop negative feedback comprising: obtaining a low-frequency feedback signal from the output of the amplifier; obtaining a high-frequency feedback signal from part of the amplifier of which high-frequency phase shift is low, wherein two-ways sampling signals have the same amplifying phase; combining the two-ways sampling signals together using a series capacitor-inductor double signal combining circuit to form one signal, the signal having low phase shift at both high and low-frequency and being used for negative loop feedback. The invention also provides a double negative feedback amplifier using the method.
Claims7
A method for double sampling loop negative feedback, comprising the steps of:
- obtaining a low-frequency feedback signal from the output of an amplifier;
- obtaining a high-frequency feedback signal from part of the amplifier of which high-frequency phase shift is low, wherein two-ways sampling signals have the same amplifying phase;
- and
- combining the two sampling signals using a series capacitor-inductor double signal combining circuit to form one signal, which has low phase shift at both high and low-frequency and is used for negative loop feedback.
A double sampling negative feedback amplifier, comprising:
- a voltage amplifying circuit used to output voltage signal and transfer it to a high-speed buffer circuit and an output buffer circuit;
- an output buffer circuit used to achieve unit voltage gain, provide amplified output signal and low-frequency feedback sampling signal for a double signal combining circuit;
- a high-speed buffer circuit used to achieve unit voltage gain and output high-frequency feedback sampling signal to a double signal combining circuit;
- a series capacitor-inductor double signal combining circuit used to combine the high and low-frequency feedback signals to form one-way compound feedback signal;
- and
- a feedback network for transfer the compound feedback signal to an inverting input of the voltage amplifying circuit.
Dependencies are inferred from the claim text.