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Capacitance multiplier circuit

A capacitance multiplier, capacitor technology, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, electrical components, etc.

Active Publication Date: 2011-02-16
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, conventional current sensing capacitive multipliers require a lot of extra power in order to realize the capacitive multiplier effect

Method used

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Embodiment Construction

[0019] Aspects of the invention are disclosed in the following description and associated drawings directed to specific embodiments of the invention. Alternative embodiments may be devised without departing from the scope of the present invention. Additionally, well-known elements of the invention will not be described in detail or will be omitted so as not to obscure the relevant details of the invention.

[0020] The word "exemplary" or "example" is used herein to mean "serving as an example, instance, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Likewise, the term "embodiments of the invention" does not require that all embodiments of the invention include the discussed feature, advantage or mode of operation.

[0021] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the...

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Abstract

A capacitance multiplier circuit is configured to sense a current through a capacitor in an RC filter of the circuit and to multiply the current so as to achieve a capacitance multiplier effect without adding additional circuitry or requiring additional power. The circuit includes an RC filter, a first signal path connected to a filter output, and a second signal path connected to an input to the filter. A current output through the filter (iout) is split between the two paths, sensed in the first path and multiplied in the second path. The multiplied current is fed back from the second path to the filter input to raise the effective capacitance of capacitor C. The capacitance multiplier circuit, in raising the effective capacitance of the capacitor in the filter, does not affect the frequency response, linearity performance and / or stability of the overall circuit.

Description

technical field [0001] Example embodiments relate generally to a capacitance multiplier circuit and to a transimpedance amplifier (TIA) circuit with a capacitance multiplier. Background technique [0002] Typically in system-on-chip (SoC) integration, on-chip capacitors occupy a large amount of silicon real estate, so it is desirable to reduce the amount of surface area they occupy on the chip. One way to solve this problem has been to use a capacitance multiplier circuit on the chip so that smaller 1X capacitors can be formed on the chip, but depending on the design requirements of the capacitance in the circuit, the capacitance multiplication can be done on the chip. Acts as a 5X or 10X capacitor in the circuit. [0003] Capacitance multipliers can be broadly classified into two basic categories: voltage-based capacitance multipliers, such as Miller capacitance multipliers; and current-based capacitance multipliers. In its basic form, a Miller capacitance multiplier sens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H11/04H03F3/08H03H11/40H03H11/48H03F3/45
CPCH03F2203/45318H03F2200/456H03H11/48H03H11/0416H03F2203/45526H03F2203/45646H03H11/405H03F3/45659H03F3/45183H03H11/483
Inventor 苏珊塔·森古皮塔肯尼思·查尔斯·巴尼特
Owner QUALCOMM INC
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