CN201323568Y - Process compensating voltage-current converter - Google Patents

Abstract

The utility model relates to a process compensating voltage-current converter, which is characterized in that the process compensation voltage-current converter comprises a current source, a current mirror image circuit and a process change compensating circuit and has the advantages of simple structure, easy implementation of the circuit and obvious compensation effect. The current mirror image circuit is used for generating currents on different branch circuits to achieve the current proportional relationship; and the process change compensating circuit is used for reducing the influence of the process change on the current output. The process compensating voltage-current converter is applied to control the frequency output of the voltage-controlled oscillator and to achieve the voltage-current conversion functions with various requirements.

Description

The technological compensa tion voltage current adapter

(1) technical field:

The utility model relates to a kind of compensating circuit of electric current and voltage conversion, especially a kind of technological compensa tion voltage current adapter.

(2) background technology:

Voltage-current converter circuit is usually used in the control of the output frequency of voltage controlled oscillator in the prior art, by the variation of voltage, causes the variation of electric current, and by the variation of electric current, the frequency of control voltage controlled oscillator is exported again.The available circuit structure as shown in Figure 1, grid voltage by transistor M1 changes, cause the variation of electric current on the whole piece branch road, electric current is subjected to the process variations influence of resistance R, resistance change scope in the integrated circuit is usually at 80%-120%, change in resistance in a big way can cause the deviation that electric current is very big, thereby makes output current value be subjected to very big influence.

(3) utility model content:

The purpose of this utility model is to propose a kind of technological compensa tion voltage current adapter, and it is simple in structure, and circuit is easy to realize that compensation effect is obvious.

The technical solution of the utility model: a kind of technological compensa tion voltage current adapter is characterized in that it comprises current source, current mirror circuit and technique change compensating circuit; Wherein, current source is an external circuit, its current output terminal links to each other with ground, and current input terminal links to each other with the input branch road of current mirror circuit, and current mirror circuit is exported to the technique change compensating circuit according to the proportionate relationship of electric current on every output branch road and input current with electric current.

Above-mentioned said technique change compensating circuit is made of transistor M1, transistor M2, transistor M3, transistor M4 and resistance R, and one road output of current mirror circuit is connected with the grid of transistor M1 and the grid of drain electrode, transistor M2, an end of resistance R; Another road output of current mirror circuit is connected with the drain electrode of transistor M2, the drain and gate of transistor M3 and the grid of M4 respectively; The source electrode of the source electrode of said transistor M1, transistor M2, the source electrode of transistor M3, the source electrode of transistor M4 and the whole ground connection of the other end of resistance R; The drain electrode of transistor M4 is connected with current output terminal.

Above-mentioned said technological compensa tion voltage current adapter utilization control voltage changes the operating current of oscillator, thereby changes the accurate control of output frequency in order to pressuring controlling oscillator frequency is exported of oscillator.

Superiority of the present utility model is: the utility model is simple in structure, and circuit is easy to realize that compensation effect is obvious; Wherein current mirror circuit is used to produce the electric current on the different branch, thereby realizes equal current proportion relation; The technique change compensating circuit is used to reduce the influence of process change on current output; The utility model can be used for the control of pressuring controlling oscillator frequency output and realizes the various different electric current and voltage translation functions that require.

(4) description of drawings:

Fig. 1 is the circuit block diagram of a kind of technological compensa tion voltage current adapter in the prior art.

Fig. 2 is the circuit block diagram of the related a kind of technological compensa tion voltage current adapter of the utility model.

Fig. 3 be the utility model and prior art circuit output current value comparison diagram (wherein, Fig. 3-1 is the output current design sketch of the technological compensa tion voltage current adapter of prior art, and Fig. 3-2 is the output current design sketch of the technological compensa tion voltage current adapter of increase the utility model technique change compensation).

Wherein, Fast is the process conditions of transistorized threshold voltage when being low voltage value, and Typical is the process conditions of transistorized threshold voltage when being representative value, and Slow is the process conditions of transistorized threshold voltage when being high-voltage value.

(5) embodiment:

Embodiment: a kind of technological compensa tion voltage current adapter (see figure 2) is characterized in that it comprises current source, current mirror circuit and technique change compensating circuit; Wherein, current source is an external circuit, its current output terminal links to each other with ground, and current input terminal links to each other with the input branch road of current mirror circuit, and current mirror circuit is exported to the technique change compensating circuit according to the proportionate relationship of electric current on every output branch road and input current with electric current.

Above-mentioned said technique change compensating circuit (see figure 2) is made of transistor M1, transistor M2, transistor M3, transistor M4 and resistance R, and one road output of current mirror circuit is connected with the grid of transistor M1 and the grid of drain electrode, transistor M2, an end of resistance R; Another road output of current mirror circuit is connected with the drain electrode of transistor M2, the drain and gate of transistor M3 and the grid of M4 respectively; The source electrode of the source electrode of said transistor M1, transistor M2, the source electrode of transistor M3, the source electrode of transistor M4 and the whole ground connection of the other end of resistance R; The drain electrode of transistor M4 is connected with current output terminal.

Above-mentioned said technological compensa tion voltage current adapter utilization control voltage changes the operating current of oscillator, thereby changes the accurate control of output frequency in order to pressuring controlling oscillator frequency is exported of oscillator.

The contrast (see figure 3) of the technique effect of the utility model and prior art:

If control voltage is Vctrl, with the variation of Vctrl, image current changes simultaneously in the utility model, the drain electrode of current direction resistance R and M1, and when technique change, resistance R change in resistance scope is drawn by following computing formula (1) at 80%-120%:

$I_{\mathrm{OUT}}=\frac{V_{\mathrm{GS}}}{R}---\left(1\right)$

Output current is subjected to the influence that resistance changes, and the scope that changes as can be known according to above-mentioned formula (1) should be 80%-120% substantially.

The ratio of the input current value of current mirror circuit and output current value is 1/n in the prior art, and the output of current mirror circuit is connected with the drain electrode of transistor M1; Control voltage Vctrl is connected with the grid of transistor M1; The source electrode of transistor M1 is connected with an end of resistance R; Resistance R other end ground connection, control voltage is Vctrl, and with the variation of Vctrl, the electric current of whole piece branch road also changes, and when technique change, resistance R change in resistance scope is drawn by following computing formula (2) at 80%-120%:

$I_{\mathrm{OUT}}=\frac{\mathrm{\β}}{2}{(V_{\mathrm{GS}}-V_{\mathrm{TH}}-I_{\mathrm{OUT}}R)}^2---\left(2\right)$

Wherein: $\mathrm{\β}=\frac{1}{2}{\mathrm{\μ}}_n{C}_{\mathrm{ox}}\frac{W}{L}---\left(3\right)$

Output current is subjected to the influence that resistance changes, and according to above-mentioned formula (2) as can be known, the scope that changes should be 0.64%-144% substantially.

Can find out significantly that thus increased technique change compensating circuit of the present utility model, the electric current and voltage conversion circuit has been reduced by effect of process variations greatly.Compare with common circuit, because circuit has been implemented the technique change compensation, so the technological compensa tion voltage current adapter is being subjected to have remarkable advantages aspect the effect of process variations.

In the above-mentioned formula: V _CtrlBe control voltage, V _GSBe the voltage between transistorized grid and the source electrode, I is an output current value, and R is the resistance value of resistance R, V _THBe transistorized threshold voltage, μ _nBe electron mobility, G _OxBe the gate oxide electric capacity of transistorized unit are, W is that transistorized raceway groove is wide, L: transistorized raceway groove is long, I _OUTBe output current value.

Claims (3)

1, a kind of technological compensa tion voltage current adapter is characterized in that it comprises current source, current mirror circuit and technique change compensating circuit; Wherein, current source is an external circuit, its current output terminal links to each other with ground, and current input terminal links to each other with the input branch road of current mirror circuit, and current mirror circuit is exported to the technique change compensating circuit according to the proportionate relationship of electric current on every output branch road and input current with electric current.

2, according to the said a kind of technological compensa tion voltage current adapter of claim 1, it is characterized in that said technique change compensating circuit is made of transistor M1, transistor M2, transistor M3, transistor M4 and resistance R, one road output of current mirror circuit is connected with the grid of transistor M1 and the grid of drain electrode, transistor M2, an end of resistance R; Another road output of current mirror circuit is connected with the drain electrode of transistor M2, the drain and gate of transistor M3 and the grid of M4 respectively; The source electrode of the source electrode of said transistor M1, transistor M2, the source electrode of transistor M3, the source electrode of transistor M4 and the whole ground connection of the other end of resistance R; The drain electrode of transistor M4 is connected with current output terminal.

3, according to the said a kind of technological compensa tion voltage current adapter of claim 1, it is characterized in that said technological compensa tion voltage current adapter utilization control voltage changes the operating current of oscillator, thereby change the accurate control of output frequency in order to pressuring controlling oscillator frequency is exported of oscillator.

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