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Switching type capacitive circuit and method for controlling switching type capacitive circuit

A capacitive circuit, switching technology, applied in the field of switched capacitive circuits, can solve problems such as reducing the performance of voltage-controlled oscillators, and achieve the effect of no need for circuit layout

Active Publication Date: 2013-10-30
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the switched capacitor circuit of the switched capacitor array may have a junction capacitance effect, and the transistors in the switched capacitor circuit may be accidentally turned on due to the voltage at the coupled output, thereby reducing VCO device performance

Method used

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  • Switching type capacitive circuit and method for controlling switching type capacitive circuit
  • Switching type capacitive circuit and method for controlling switching type capacitive circuit
  • Switching type capacitive circuit and method for controlling switching type capacitive circuit

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Embodiment Construction

[0025] Although the advantages of the switched capacitor circuit disclosed in the present invention are explained based on the application of the LC resonant tank circuit in the voltage controlled oscillator, this is not used as a limitation of the present invention. In other words, the switched capacitor circuit disclosed in the present invention The capacitor circuit can be applied to (but not limited to) a voltage controlled oscillator, a resonant tank circuit, or other circuits with adjustable frequency switched capacitor arrays.

[0026] see figure 1 , figure 1 It is a schematic diagram of a first embodiment of the switched capacitor circuit of the present invention. The switched capacitor circuit 100 includes an inverter 110 , a first capacitor C1 and a first switch unit 120 . The inverter 120 is used for receiving a control signal CS to generate an inverted control signal ICS corresponding to the control signal CS. The first capacitor C1 is coupled between a first ou...

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Abstract

Disclosed are a switching type capacitive circuit and a method for controlling the switching type capacitive circuit. The switching type capacitive circuit comprises an inverter, a first capacitor and a first switch unit, wherein the inverter is used for receiving a control signal to generate an inverting control signal corresponding to the control signal, the first capacitor is coupled between a first output end and a first endpoint, the first switch unit is used for receiving a first input signal and a second input signal and coupling the second input signal selectively to the first endpoint according to the first input signal, the first input signal is determined by either the control signal or the inverting control signal, and the second input signal is determined by either the control signal or the inverting control signal.

Description

technical field [0001] The present invention relates to a switched capacitor circuit, in particular to a switched capacitor circuit that uses a delayed control signal and generates an inverted control signal for switching, and its related control method. Background technique [0002] In today's communication systems, a local oscillation signal (LO signal) is mainly generated by a voltage-controlled oscillator (VCO). For a voltage controlled oscillator including an inductor-capacitor tank circuit (LC tank circuit), due to its good quality factor (quality factor) and signal purity (signal purity), it can provide accurate The local oscillator signal is used to improve the sensitivity of a radio frequency transceiver (RF transceiver). [0003] Generally speaking, the inductor on the chip occupies a relatively large area. Therefore, the oscillation frequency of the voltage-controlled oscillator is usually changed by adjusting the capacitor value, wherein the switch-capacitor arr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/32
Inventor 杨育哲
Owner REALTEK SEMICON CORP