Preamplifier
A preamplifier and amplifier technology, applied in the direction of amplifiers, differential amplifiers, amplifier combinations, etc., can solve the problems of a single capacitor in the filter circuit, the miniaturization of the preamplifier, and the increase in the hardware cost of the preamplifier, so as to reduce the hardware cost Effect
Inactive Publication Date: 2017-03-29
UPI SEMICON CORP
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Problems solved by technology
[0003] However, most of the filter circuits in existing preamplifiers are composed of a single capacitor
In addition, the capacitance used to form the filter circuit must be very large to filter out the high-order harmonics caused by the input offset voltage, which increases the hardware cost of the preamplifier and limits the miniaturization of the preamplifier
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[0044] figure 1 It is a schematic circuit diagram of a preamplifier according to an embodiment of the present invention. Such as figure 1 As shown, the preamplifier 10 includes a programmable gain amplifying circuit (programmable gain amplifying circuit) 110 and a filter circuit 120 . Wherein, the programmable gain amplifier circuit 110 has a single output terminal 113 . The filter circuit 120 includes a first switched-capacitor filter (switched-capacitor filter) 121 and a second switched-capacitor filter 122 . The first switched capacitor filter 121 is coupled to the single output terminal 113 of the programmable gain amplifier circuit 110 , and the first switched capacitor filter 121 is connected in parallel to the second switched capacitor filter 122 .
[0045] The first switched capacitor filter 121 and the second switched capacitor filter 122 have the same first mode and second mode, and are respectively switched between the first mode and the second mode. Operational...
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A preamplifier including a programmable gain amplifying circuit and a filtering circuit is provided. The programmable gain amplifying circuit has a single output terminal. The filtering circuit includes a first switched-capacitor filter and a second switched-capacitor filter. The first switched-capacitor filter is coupled to the single output terminal. The second switched-capacitor filter is connected in parallel with the first switched-capacitor filter. The first switched-capacitor filter and the second switched-capacitor filter are respectively switched between a first mode and a second mode. When the first switched-capacitor filter is switched to the first mode, the second switched-capacitor filter is switched to the second mode.
Description
technical field [0001] The present invention relates to a preamplifier, and more particularly to a preamplifier with a filter circuit. Background technique [0002] The analog front end (Analog front end, referred to as AFE) is composed of an analog circuit and a digital-analog hybrid circuit, and is responsible for performing many operations, such as: signal acquisition, analog filtering...etc. In signal acquisition, the preamplifier in the analog front-end plays an important role, and it often determines the resolution and signal-to-noise ratio of the system. Generally speaking, the preamplifier amplifies the differential input signal through a chopper amplifier, and filters out the higher harmonics caused by the input offset voltage of the chopper amplifier through a filter circuit. [0003] However, most of the filter circuits in existing preamplifiers are composed of a single capacitor. In addition, the capacitor used to form the filter circuit must be very large to f...
Claims
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IPC IPC(8): H03G3/20H03F3/45
CPCH03F3/45475H03F3/45968H03F3/68H03F2200/411H03F2203/45138H03F2203/45522H03F2203/45528H03F2203/45562H03F2203/45616H03F2203/45644H03F2203/45726H03H19/004H03F2200/271
Inventor 林文胜
Owner UPI SEMICON CORP