CN208656731U

CN208656731U - One kind may be programmed high-precision relaxor

Info

Publication number: CN208656731U
Application number: CN201821427168.0U
Authority: CN
Inventors: 安雯雯; 魏聪; 许新愉; 易璐茗; 张琳; 陈铖颖
Original assignee: Xiamen University of Technology
Current assignee: Xiamen University of Technology
Priority date: 2018-08-31
Filing date: 2018-08-31
Publication date: 2019-03-26
Anticipated expiration: 2028-08-31

Abstract

The utility model relates to CMOS technical field of analog integrated circuit design, and particularly one kind may be programmed high-precision relaxor.The utility model discloses one kind may be programmed high-precision relaxor, condenser network including programmable frequency, threshold compataror circuit and control circuit, the condenser network of the programmable frequency includes the capacitor charge and discharge circuit of switching circuit and programmable frequency, the capacitor charge and discharge circuit that the switching circuit is used to control programmable frequency carries out periodical charge and discharge, the threshold compataror circuit is used to the voltage on the capacitor charge and discharge circuit of programmable frequency carrying out differential mode amplification with threshold voltage to export, draw power supply or ground potential, complete comparator function, the control circuit is used to detect the voltage of charge and discharge capacitance top crown, and with height, Low threshold reference voltage is compared, generate the control signal of control switch circuit operation, generate the output signal voltage of high-accuracy stable.

Description

One kind may be programmed high-precision relaxor

Technical field

The utility model belongs to CMOS technical field of analog integrated circuit design, more particularly to the programmable high-precision of one kind Relaxor.

Background technique

In many Application of integrated circuit, clock generation circuit is an essential module, according to different applications Scene demand, there are many kinds of the clock generation circuits of type, and relaxor is at low cost standby convenient for integrated feature with its It is praised highly.

However, output frequency is non-programmable in traditional relaxation oscillator circuit, and due to temperature and delay It influences, the output frequency of relaxor is very unstable.

Summary of the invention

The purpose of this utility model is to provide one kind may be programmed high-precision relaxor to solve above-mentioned presence The problem of.

To achieve the above object, the technical solution adopted in the utility model are as follows: one kind may be programmed high-precision relaxation oscillation Device, condenser network, threshold compataror circuit and control circuit including programmable frequency, the condenser network of the programmable frequency Capacitor charge and discharge circuit including switching circuit and programmable frequency, the switching circuit are used to control the capacitor of programmable frequency Charge-discharge circuit carries out periodical charge and discharge, and the threshold compataror circuit is used for the capacitor charge and discharge circuit of programmable frequency On voltage and threshold voltage carry out differential mode amplification and export, draw and arrive power supply or ground potential, complete comparator function, the control is electric Road is used to detect the voltage of charge and discharge capacitance top crown, and is compared with high and low threshold reference voltage, generates control switch electricity The control signal of road movement, generates the output signal voltage of high-accuracy stable.

Further, the condenser network of the programmable frequency further includes mirror image circuit, and the mirror image circuit passes through switch Circuit provides stable charging and discharging currents to the capacitor charge and discharge circuit of programmable frequency.

Further, the capacitor charge and discharge circuit of the programmable frequency includes charge and discharge capacitance C0, charge and discharge capacitance C1, NMOS tube NM4 and NMOS tube NM5, charge and discharge capacitance C0, charge and discharge capacitance C1 go here and there with NMOS tube NM4 and NMOS tube NM5 respectively Connection, the on-off by controlling NMOS tube NM4 and NMOS tube NM5 realize programmable frequency.

Further, the threshold compataror circuit includes trsanscondutance amplifier OTA_osc and reverse buffer INV_ Osc_1, trsanscondutance amplifier OTA_osc carry out the top crown voltage of charge and discharge capacitance C0 and charge and discharge capacitance C1 and threshold voltage Differential mode amplification draws to power supply or ground potential to output it signal V1, completes comparator function, reverse buffer INV_osc_ Output signal V1 progress reverse phase is obtained output signal V2 by 1.

Further, the control circuit includes 2 transmission gates I1 and I2.

The advantageous effects of the utility model:

The utility model effectively realizes the programming of frequency, passes through mirror image circuit by the condenser network of programmable frequency Stable charging and discharging currents are provided to capacitor charge and discharge circuit；Difference mode signal amplified by threshold compataror circuit defeated Out, it draws and arrives power supply or ground potential, complete comparator function；By control circuit detection charge and discharge capacitance top crown voltage, and with High-low threshold value reference voltage is compared, and is generated the control signal of control switch circuit operation, is generated the output of high-accuracy stable Signal voltage.The relaxor have the advantages that high-precision, it is programmable, suitable for Industry Control class chip.

Detailed description of the invention

Fig. 1 is the circuit diagram of the utility model specific embodiment；

Fig. 2 is the circuit diagram of the trsanscondutance amplifier OTA_osc of the utility model specific embodiment；

Fig. 3 is the circuit diagram of the reverse buffer INV_osc_1 of the utility model specific embodiment；

Fig. 4 is the circuit diagram of the transmission gate of the utility model specific embodiment.

Specific embodiment

Now in conjunction with the drawings and specific embodiments, the present invention will be further described.

As shown in Figure 1, one kind may be programmed high-precision relaxor, condenser network 100, door including programmable frequency Comparator circuit 200 and control circuit 300 are limited, the condenser network 100 of the programmable frequency includes mirror image circuit, switching circuit With the capacitor charge and discharge circuit of programmable frequency, the mirror image circuit is by switching circuit to the capacitor charge and discharge of programmable frequency The charging and discharging currents of circuit with stable, the threshold compataror circuit 200 are used for the capacitor charge and discharge electricity of programmable frequency The voltage and threshold voltage of road carry out differential mode amplification and export, and draw and arrive power supply or ground potential, complete comparator function, the control Circuit 300 is used to detect the voltage of charge and discharge capacitance top crown, and is compared with high and low threshold reference voltage, generates control The control signal of switching circuit movement, generates the output signal voltage of high-accuracy stable.

In this specific embodiment, the capacitor charge and discharge circuit of the programmable frequency includes charge and discharge capacitance C0, charge and discharge Capacitor C1, NMOS tube NM4 and NMOS tube NM5, charge and discharge capacitance C0, charge and discharge capacitance C1 respectively with NMOS tube NM4 and NMOS tube NM5 series connection, the on-off by controlling NMOS tube NM4 and NMOS tube NM5 realize programmable frequency, the electricity of the programmable frequency Capacitive circuit 100 further include PMOS tube PM0, PMOS tube PM1, PMOS tube PM2, PMOS tube PM3, PMOS tube PM3, PMOS tube PM4, PMOS tube PM5, PMOS tube PM6, NMOS tube NM0, NMOS tube NM1, NMOS tube NM2 and NMOS tube NM3, specific connection relationship are detailed in Fig. 1, this is no longer described in detail.

In this specific embodiment, the threshold compataror circuit 200 includes trsanscondutance amplifier OTA_osc, reverse buffer INV_osc_1, PMOS tube PM7, PMOS tube PM8, NMOS tube NM6 and NMOS tube NM7, the control circuit 300 include transmission gate I1, transmission gate I2, PMOS tube PM9, NMOS tube NM8, NMOS tube NM9, NMOS tube NM10, NMOS tube NM11, resistance R0 and resistance R1, specific connection relationship are detailed in Fig. 1, this is no longer described in detail.

As shown in Fig. 2, in this specific embodiment, trsanscondutance amplifier OTA_osc include PMOS tube PM10, PMOS tube PM11, PMOS tube PM12, PMOS tube PM13, NMOS tube NM12, NMOS tube NM13, NMOS tube NM14 and NMOS tube NM15, specific connection are closed Fig. 2 is detailed in system, this is no longer described in detail.

As shown in figure 3, reverse buffer INV_osc_1 includes PMOS tube PM14 and NMOS tube in this specific embodiment NM16, specific connection relationship are detailed in Fig. 3, this is no longer described in detail.Reverse buffer INV_osc_1 is inputted for generating low and high level Current potential A is opposite with output current potential Y.

As shown in figure 4, transmission gate I1 includes PMOS tube PM15 and NMOS tube NM17, specific connection in this specific embodiment Relationship is detailed in Fig. 4, this is no longer described in detail, by the conducting and shutdown that control the port CON and CONQ control of Electric potentials transmission gate I1.Transmission The structure of door I2 is identical as transmission gate I1.

Working principle:

For the condenser network 100 of programmable frequency: when controlling signal PDB is low level, PMOS tube PM0, PMOS tube PM1, PMOS tube PM2, PMOS tube PM3, PMOS tube PM4, PMOS tube PM5, PMOS tube PM6, NMOS tube NM0, NMOS tube NM1 and NMOS tube NM3 conducting；When control signal B0 is high level, NMOS tube NM4 conducting；When control signal B1 is high level, NMOS tube NM5 conducting, charge and discharge capacitance C0 and C1 charge, and charge and discharge capacitance C0 and C1 top crown current potential is higher than threshold compataror circuit 200 Threshold voltage INN when, control circuit 300 can be such that PMOS tube PM6 disconnects, and NMOS tube NM2 conducting, charge and discharge capacitance C0 and C1 are logical NMOS tube NM3 electric discharge is crossed, charge and discharge capacitance C0 and C1 top crown current potential constantly declines as capacitor discharges, as charge and discharge capacitance C0 When being lower than the threshold voltage INN of threshold compataror circuit 200 with C1 top crown current potential, control circuit 300 can be such that PMOS tube PM6 leads Logical, NMOS tube NM2 is closed, and charge and discharge capacitance C0 and C1 conducting, PMOS tube PM5 charging, not stopping circulation in this way can be in charge and discharge Waveform is exported on capacitor C0 and C1.

For threshold compataror circuit 200: if control signal RC_PD is high potential, controlling signal PDB is low potential, Controlling signal PD is height, and PMOS tube PM11 is connected, NMOS tube NM12 and NMOS tube NM15 conducting, trsanscondutance amplifier OTA_osc's OUT terminal current potential is that (control signal PDB is low potential to low potential, and control signal VBP is high potential, and PMOS tube PM10 is cut always Only), so trsanscondutance amplifier OTA_osc does not work.If control signal RC_PD is low potential, control signal PDB is high voltage, Control signal PD is low-voltage, and control signal VBP is high voltage, PMOS tube PM10 conducting, PMOS tube PM11 cut-off, NMOS tube NM12 and NMOS tube NM15 cut-off (trsanscondutance amplifier OTA_osc normal work), the INP and INN two of trsanscondutance amplifier OTA_osc End is difference mode signal, and output is stacked to power supply or ground by trsanscondutance amplifier OTA_osc, completes comparator function, reversed slow It rushes device INV_osc_1 and output signal V1 progress reverse phase is obtained into output signal V2.

For control circuit 300: if output signal V1 is high potential, output signal V2 is low potential, for transmission gate I1 is closed, and transmission gate I2 is opened；Feedback loop level is low reference level；If output signal V1 is low potential, export Signal V2 is high potential, and transmission gate I1 is opened, and transmission gate I2 is closed；Feedback loop level is high reference level, is led to The numerical value for crossing the grid width W, resistance R0 and resistance R1 that change PMOS tube PM9, can be adjusted feedback loop level.

Although specifically showing and describing the utility model in conjunction with preferred embodiment, those skilled in the art is answered This is understood, in the spirit and scope for not departing from the utility model defined by the appended claims, in form and details On the utility model can be made a variety of changes, be the protection scope of the utility model.

Claims

1. one kind may be programmed high-precision relaxor, it is characterised in that: condenser network, thresholding ratio including programmable frequency Compared with device circuit and control circuit, the condenser network of the programmable frequency includes the capacitor charge and discharge of switching circuit and programmable frequency Circuit, the capacitor charge and discharge circuit that the switching circuit is used to control programmable frequency carry out periodical charge and discharge, the door Limit comparator circuit be used for by the capacitor charge and discharge circuit of programmable frequency voltage and threshold voltage carry out differential mode amplify it is defeated Out, it draws and arrives power supply or ground potential, complete comparator function, the control circuit is used to detect the electricity of charge and discharge capacitance top crown Pressure, and be compared with high and low threshold reference voltage, the control signal of control switch circuit operation is generated, it is steady to generate high-precision Fixed output signal voltage.

2. according to claim 1 may be programmed high-precision relaxor, it is characterised in that: the programmable frequency Condenser network further includes mirror image circuit, and capacitor charge and discharge circuit of the mirror image circuit by switching circuit to programmable frequency mentions For stable charging and discharging currents.

3. according to claim 2 may be programmed high-precision relaxor, it is characterised in that: the programmable frequency Capacitor charge and discharge circuit includes charge and discharge capacitance C0, charge and discharge capacitance C1, NMOS tube NM4 and NMOS tube NM5, charge and discharge capacitance C0, charge and discharge capacitance C1 connect with NMOS tube NM4 and NMOS tube NM5 respectively, pass through control NMOS tube NM4's and NMOS tube NM5 On-off and realize programmable frequency.

4. according to claim 3 may be programmed high-precision relaxor, it is characterised in that: the threshold compataror electricity Road includes trsanscondutance amplifier OTA_osc and reverse buffer INV_osc_1, and trsanscondutance amplifier OTA_osc is by charge and discharge capacitance C0 Carry out differential mode amplification with the top crown voltage of charge and discharge capacitance C1 and threshold voltage, to output it signal V1 draw to power supply or Ground potential, completes comparator function, and output signal V1 progress reverse phase is obtained output signal V2 by reverse buffer INV_osc_1.

5. according to claim 1 may be programmed high-precision relaxor, it is characterised in that: the control circuit includes 2 transmission gates I1 and I2.