Differential voltage-controlled oscillator (VCO) circuit structure for reinforcing single-event transients (SET)

A voltage-controlled oscillator and single-event transient technology, applied in power oscillators, automatic power control, electrical components, etc., can solve problems such as lag, voltage rise, phase difference, etc., to reduce sensitivity and improve suppression capability , reduce the effect of jitter

CN101572546AInactive Publication Date: 2009-11-04NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2009-11-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a differential voltage-controlled oscillator (VCO) structure for reinforcing single-event transients (SET). In order to improve the anti-SET capability of the conventional symmetrical-load VCO structure, the invention has two improvements that: first, tail current tube drain Vp of all delay units are in a short circuit so as to improve the immunity of a VCO circuit to SET effect; and second, two diode-connected PMOS pipes in symmetrical loads are cross-coupled and connected so as to ensure that the output of the VCO structure after the Vp short circuit still has differential characteristics. The SET sensitivity of the improved VCO is greatly reduced. The structure can effectively improve anti-SET capability, and also has the characteristics of simple structure, high working frequency and good linearity.
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Description

technical field

[0001] The present invention mainly relates to the design field of a voltage-controlled oscillator (VCO) in a single-event transient (SET) reinforced phase-locked loop circuit, in particular to a differential voltage-controlled oscillator (VCO) for single-event transient (SET) reinforcement. VCO) circuit structure. Background technique

[0002] A voltage-controlled oscillator (Voltage-controlled-Oscillator, VCO) is mainly used in circuits such as clock generation, frequency multiplication and frequency synthesis. In radiation environments, such as orbital space where satellites operate, electronic equipment with voltage-controlled oscillator (VCO) circuit modules is highly susceptible to single event effects. Single event transient is an effect caused by high-energy particles bombarding the sensitive junction of the circuit. Due to the energy deposition of the particles after the bombardment, impact ionization is caused, and the ionized electron-hole pairs a...

Examples

Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] like Figure 4 As shown, the present invention is used for the differential voltage-controlled oscillator (VCO) structure of anti-single-event transient (SET) reinforced voltage-controlled oscillator, and it is made up of a plurality of differential delay units, and the tail current source tube M7 of all delay units The drains Vp are all shorted together. The structure of its delay unit is as follows image 3 As shown, it includes a first NMOS transistor M1, a second NMOS transistor M2, a third NMOS transistor M7, a first PMOS transistor M3, a second PMOS transistor M4, a third PMOS transistor M5, and a fourth PMOS transistor M6. Among them, the first NMOS transistor M1 and the second NMOS transistor M2 form a differential pair, the gates of which are respectively connected to the differential inputs IN+ and IN-, the drains o...