Pseudo-differential motion switching capacitance circuit
A technology of switching capacitors and capacitors, which is applied in the direction of improving amplifiers to reduce temperature/power supply voltage changes, differential amplifiers, DC-coupled DC amplifiers, etc., and can solve the problems of general products without suitable structure, high power, and inconvenience
Active Publication Date: 2012-05-30
HIMAX TECH LTD +1
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Problems solved by technology
In order to reduce the common-mode voltage error, it is necessary to try to increase the open-loop gain and bandwidth of the analog adder / subtractor 704, but this will consume a large amount of power
[0014] It can be seen that the common-mode stabilization technology of the above-mentioned existing pseudo-differential switched capacitive circuit obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently.
In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but for a long time no suitable design has been developed, and the general product has no suitable structure to solve the above-mentioned problems. This is obviously the relevant industry. Urgent problem
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[0063] In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure, and characteristics of the pseudo-differential switched capacitive circuit proposed according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. And its effect, detailed description is as follows.
[0064] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. Through the description of the specific implementation mode, a more in-depth and specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained. However, the accompanying drawings are only for reference and description, and are not used ...
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The invention relates to a pseudo-differential motion switching capacitance circuit, which comprises a differential motion suspending joint sampling circuit and an integrator, wherein the differential motion suspending joint sampling circuit is provided with a pseudo-differential motion structure, a differential motion positive input, a differential motion negative input, a differential motion positive output and a differential motion negative output, wherein the common-mode grain value of the differential motion suspending joint sampling circuit is 1; the integrator is electrically coupled to the differential motion positive output and the differential motion negative output; and the integrator feeds back the integral by detecting the common-mode voltage disturbance of the differential motion positive output and the differential motion negative output, outputs the integral to the differential motion suspending joint sampling circuit and stabilizes an output common-mode level of the differential motion positive output and the differential motion negative output to an expected level. The invention can substantially reduce the common-mode voltage drift caused by the charge injectioneffect by applying a common-mode stabilizing technology of the pseudo-differential motion switching capacitance circuit, in particular to an integral form technology.
Description
technical field [0001] The invention relates to a pseudo-differential switching capacitive circuit, in particular to a pseudo-differential switching capacitive circuit with integral common-mode voltage stabilization technology. Background technique [0002] In a high-precision switched capacitor circuit, an amplifier with high gain and high linearity is usually required, and the system performance is often determined by the performance of the amplifier. However, in an advanced manufacturing process, in order to ensure the reliability of the circuit, the operating voltage of the circuit must decrease accordingly, thus causing the signal range of the amplifier to be severely compressed, increasing the difficulty of amplifier design. In order to maintain a sufficient signal-to-noise ratio, the power consumption of the amplifier is even increased. [0003] see Figure 1A Shown is a schematic diagram of a conventional fully differential amplifier circuit. A conventional fully d...
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IPC IPC(8): H03F1/30H03F3/45
Inventor张顺志林进富黄志豪
OwnerHIMAX TECH LTD