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a cmos oscillator

A technology of oscillators and inverters, applied in the direction of pulse generation, electrical components, and electric pulse generation, can solve the problems of increasing the complexity of circuit structure, offset voltage oscillator output frequency deviation, increasing circuit area and cost, etc., to achieve Fast response time at power-on start-up, improved circuit structure, reduced area and cost

Inactive Publication Date: 2017-12-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Traditional RC oscillators are widely used, but there are also some disadvantages: since there are two flipping voltages V1 and V2 in the circuit, the circuit needs two operational amplifiers A1 and A2 as comparators, which will increase the circuit The area and cost increase the complexity of the circuit structure, and the difference in the offset voltage of the two comparators will cause the deviation of the oscillator output frequency

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0018] A CMOS oscillator proposed by the present invention, such as figure 2 As shown, it includes a level conversion circuit, a charging and discharging circuit, a current source I1, a first inverter INV1, a second directional device N2, a third directional device N3, a fourth inverter INV4, a fifth inverter INV5, The first NMOS transistor N1, the second NMOS transistor N2, the NAND gate NAND, the DC power supply VDC and the first capacitor C1; wherein, the power input terminal of the level conversion circuit is connected to the power supply VDD, and its first input terminal is connected to the first capacitor C1. The drain of the second NMOS transistor N2, the output of the fifth inverter and the input of the fourth inverter, the second input of which is connected to the drain of the first NMOS transistor N1, the input of the fifth inverter and the input of...

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Abstract

The invention belongs to the technical field of analog integrated circuits, and in particular relates to a CMOS oscillator. The present invention adopts the pumping characteristics of capacitors to replace the traditional charging and discharging process of resistors and capacitors, and adopts a combination of level conversion and capacitor pumping to easily realize high-speed oscillator characteristics. The invented circuit structure is simple, The area of ​​the traditional oscillator circuit using an operational amplifier is reduced and the cost is reduced; at the same time, a bistable circuit is introduced, combined with a level shifting circuit, and the delay of the level shifting circuit is used to reduce the delay when the power is turned on. , can quickly start the response, greatly shortening the start-up time of the oscillator. The invention is particularly applicable to high frequency CMOS oscillators.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a CMOS oscillator. Background technique [0002] Oscillator (English: Oscillator), referred to as OSC, is an electronic device used to generate repetitive electronic signals (usually sine waves or rectangular waves). The various oscillating signals generated by it can provide various timing, switch control and signal Various modulations, etc., have become key functional modules in analog and digital circuit systems, and have an important impact on the performance of digital and analog signal processing. With the maturity of semiconductor CMOS technology, CMOS oscillators develop rapidly and gradually replace traditional oscillators. [0003] Oscillators are mainly divided into RC oscillators, LC oscillators, and crystal oscillators according to different circuit structures. figure 1 Shown is a traditional RC oscillator structure block diagram, inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K3/012
Inventor 方健梁湛周义明李桂英沈逸骅
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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