JPS62132405A - Crystal oscillation circuit - Google Patents

Abstract

PURPOSE:To prevent the power loss at oscillation stop by providing a current interruption control circuit operated so as to prevent current from flowing to a current path formed in an oscillation inverting circuit, a feedback resistance circuit and a switching circuit when the oscillation section stops the oscillation. CONSTITUTION:The titled circuit is provided with an oscillation input line 2 and an oscillation output line 3 connected to a crystal oscillator 1, the oscillation section having an oscillation amplifying inverting circuit 4 and a feedback resistance circuit 5 connected respectively in parallel between the oscillation input line 2 and the oscillation output line 3, a switching circuit 18 bringing the level of the oscillation input line to the 1st level when the oscillation section is oscillated and bringing the level of the oscillation input line 2 to the 2nd level when the oscillation section is stopped, an oscillation stop control means 21 connected to the circuit 18 and making the circuit 18 conductive/ nonconductive and the current interruption control circuit 22 operated so as to prevent a current from flowing to a current path formed among the oscillation amplification inverting circuit 4, the feedback resistance circuit 5 and the switching circuit 18. Thus, the through-current generated at the oscillation stop is interrupted to prevent power loss.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a crystal oscillation circuit, and in particular, a current cutoff function is added to prevent power loss when one oscillation is stopped. Regarding crystal oscillation circuits.

[Conventional technology]

FIG. 5 shows a conventional crystal oscillation circuit diagram having an oscillation stop function. Oscillation input line 92 connected to crystal oscillator 91
A P-type MOSFET 9 is connected between the output line 93 and the oscillation output line 93.
An oscillation amplification inverter circuit 107 consisting of 4 and N-type M08F''BT95 is connected.

These P type M08 FlflT 94 and N type MOSFE
The gate of each T 95 is connected to the oscillator unit 92, and the drain is connected to the oscillation output line 93. The source and substrate of P-type MOSFET 94 are connected to the positive power supply 96, and the source and substrate of N-type MOSFET 95 are connected to G.
Connected to ND97.

In addition, P-type MOSFET 98 and N-type MOSFET 9
The feedback resistor circuit 108 consisting of 9 is connected in parallel with the one-oscillation amplification inverter circuit 107, and the drains of these P-type M08FETs 9B and NMOSFETs 99 are connected to the single-oscillation type MOSFET 92, and the sources is connected to the oscillation output line 93. The gate of the P-type MOSFET 98 is connected to GND 101 and the substrate is connected to the positive power source 100, and the gate of the N-type MOSFET 99 is connected to the positive power source 102 and the substrate is connected to GND 103.

Furthermore, the drain of a P-type switching MOSFET 104 having a switching function is connected to the single oscillation type Kaline 92, and the source and substrate are connected to the positive [source 10].
5. This switch is for the gate, M for ching.
An oscillation stop control terminal 106 is connected to send a control signal for starting or stopping the O8FnT 104.

Still another conventional example is shown in FIG. Figure 6 of these chopsticks.

The oscillation amplification inverter circuit 107 shown in FIG.

It is replaced with a NAND circuit.

That is, the oscillation input line 1 connected to the crystal oscillator 111
12 and the oscillation output line 113, there is a NAN for oscillation amplification.
The D circuit 114 is connected and this oscillation amplification NAN
The D circuit 114 includes two P-type MOSFETs 115 .

120 and two N-o MospwT116.118. The gates of the first P-type M08FET 115 and the M1 N-type MOSFET 116 are connected to the one-shot loss input line 112, and the drains are connected to the oscillation output line 113.

The source and substrate of the first P-type MO8FHT 115 are connected to a positive power supply 117, and the first N-type MO8FFi
The source of T 116 is the second N-type MOSFET 11B
The drain of the substrate is N type M08FFliT11B of Folder 2
board and GND 119. second P
The source and substrate of type MOSFET 120 are connected to the positive power supply 12.
1, and the drain is connected to the first P-type MO81
T 115 and one end 122 between the drain of the first N-type M08FET 116 and the first root line 113 .

Also, a second P-type MOSFET 120 and a second N-type MOSFET 120
1 oscillation stop control terminal 1 is connected to the gate of O8F'ET118.
23 are connected. This oscillation amplification NAND circuit 1
P-type MOSFET 124 and N-type MOS in parallel with 14
A feedback resistor circuit 126 composed of an FET 125 is connected.

PfiMOS that constitutes this feedback resistor circuit 126
The drains of each of the FET 124 and the N-type MO8FI13T 125 are connected to the oscillation input line 112! This is connected,
The source is connected to the oscillation output line 113#. P
The gate of fiMOSFET 124 is connected to GND 129,
The board is connected to the positive power supply 127, and the N-type MOSFET 1
The gate of 25 is connected to the positive power supply 130° and the substrate is connected to GND 12B.

Although not shown in both FIGS. 5 and 6, a first capacitor is connected to one oscillation input line, and a second capacitor is connected to one oscillation output line.

[Problem that the invention seeks to solve]

The conventional circuit shown in FIG.
When MOSFET 6 is at the positive power supply voltage level (hereinafter referred to as logic ``1''), the switching MOSFET 104 becomes non-conductive, and the oscillation section including the 1-oscillation amplifying circuit 107 and the feedback resistor circuit 108 becomes non-conductive. It oscillates normally.Also, the 1 oscillation stop control terminal 106 is connected to the GND'lJl pressure level (
(described below as function 3!1'''O''), switching M
The O8FgT 104 becomes conductive and the voltage level of the 1 oscillation input line 92 changes to this switching MOSFET 1.
Connected to the source and substrate of 04. It is fixed at the positive power supply voltage level "1".

As a result, the P-type M08FET 94 configuring the one-shot amplification inverter circuit 107 is non-conductive, and the N-type MOSFET
95 becomes conductive and one oscillation output line 93 is connected to GND 97
This causes the oscillation section including the oscillation amplification inverter circuit 107 and the feedback resistor circuit 108 to stop oscillating.

At this time, P type M08FET 98 and N type MOSFET
Since the feedback resistor circuit 108 consisting of the feedback resistor circuit 108 . and switching MOSFET 1
04, a through current flows between GND 97 and the positive power supply 105, causing power loss.

On the other hand, in the conventional diagram shown in FIG. 6, N-type MOSFET 118 and P
When 11” is applied to the gate of W MOSFET 120.

Since the P-type MOSFET 120 becomes non-conducting, it becomes P-type M.
OSFET115 and N-type MOSFET 116,11
8 constitutes an inverter circuit, which is driven as a normal oscillation circuit.

Similarly, when @0” is applied, P type M08FET 12
Since 0 is conductive and N-type M08FET 118 is non-conductive, 1 oscillation output line 113 is at the voltage level of positive power supply 121 @
It is fixed at 1" and oscillates or stops. At this time, it is the same as in Figure 5.

A through current flows between the positive power supply 121 and GND (not shown) via the P-type MOSFET 120 and the feedback resistor circuit 126, resulting in significant power loss.

The present invention has been made in consideration of the above circumstances, and there is no through current flowing as in conventional circuits.

An object of the present invention is to provide a crystal light four-pin circuit which is improved so that power loss does not occur.

[Means to solve the problem]

an oscillation unit having an oscillation input line and an oscillation output line connected to a crystal oscillator, and an oscillation amplification inverting circuit and a feedback resistance circuit connected in parallel between the oscillation input line and the oscillation output line, respectively; one connected to the oscillation input line, the level of this oscillation input line is set to the first level when the oscillation unit is set to the oscillation state, and the level of this oscillation input line is set to the first level when the first oscillation unit is set to the stop state; a switching circuit that sets the switching circuit to a second level; an oscillation stop control means that is connected to the switching circuit and makes the switching circuit conductive or non-conductive; In this case, there is provided a crystal oscillation circuit comprising the oscillation amplification inverting circuit, the feedback resistor circuit, and a current cutoff control circuit that operates to prevent current from flowing through the current path formed by the switching circuit.

[Effect]

In a crystal oscillator circuit configured in this way, a current cutoff control circuit is installed to prevent current from flowing through the current paths formed in the oscillation amplification inverting circuit, the feedback resistor circuit, and the switching circuit when the oscillation circuit stops oscillating. is activated.

〔Example〕

A crystal oscillation circuit which is an embodiment of the present invention and which is improved by the present invention is shown in FIG.

Oscillation input line 2 and oscillation output line 3 connected to crystal oscillator 1, oscillation amplification inverting circuit 4 and feedback resistance circuit connected in parallel between these oscillation input line 2 and oscillation output line 3, respectively. An oscillation unit having 5 and 5 is connected.

The oscillation amplification inverting circuit 4 includes, for example, a P-type M08FET 6.
An oscillation amplification inverter circuit composed of an N-type MOSFET 7 is used. These P-type MOSFET6
and N-type M08FET 7, each with its gate connected to the oscillation input line 2 and its drain or source connected to the oscillation output line 3.
It is connected to the.

For the feedback resistor circuit 5, for example, a feedback resistor transform gate circuit composed of a P-type M08FET 12 and an N-type M08FB'I' 15 is used. The drains or sources of these P-type MO-8 FIDT 12 and N-type MUSFET 13 are connected to the oscillation input line 2, and one source or drain is connected to the oscillation input line 3. The gate of P-type MOSFET 12 is GN
D14 board is connected to positive power supply 16, N type M08FE
The gate of T13 is connected to the positive power supply 15. ．． The 4i board is connected to GND17.

Note that these crystal oscillators 1. The oscillation unit composed of the oscillation amplification circuit 4 and the two-band return resistance circuit 5 is connected to the oscillation input line 21.
By connecting a capacitor to each oscillation output line 3, it operates as a crystal oscillation circuit.

A switching circuit 18 for driving or stopping the oscillation section is connected to the oscillation input line 2. For example, a P-type M08FET 19 is used for this switching circuit 18. The source or drain of the P fi MOSFET 19 is connected to the oscillation input line 2, and the other source or drain is connected to the positive power supply 20, and a voltage level signal is applied to the gate to make the P type MOSFET 19 conductive or non-conductive. An oscillation stop control means 21 for making conduction is connected.

Furthermore, a current cutoff control circuit that has a function of cutting off the through current that was present in the past is connected.

For example, in the embodiment shown in FIG.
7 by newly providing a MOSFET for each of the oscillation stop control means 21 and using the voltage level signal of the 1 oscillation stop control means 21.

It is called IL (IL).

As is clear from Figure 1, oscillation increase 11 and inverting circuit 4.
P-type MOSFET 6 and N-type M08F that make up
ET 7.

The same conductor for each source or drain
SFET is connected. That is, P-type MOSFET
FW MO8FJ13T for the source or drain of 6
The drain or source of N-type MOSFET 9 is connected to the drain or source of N-type MOSFET 8 and the source or drain of N-type MOSFET 7. Also, P type MO8FFi'
The source or drain of r8 is connected to the positive power supply 10. One oscillation stop control means 21 is connected to the gate via an inverter circuit, the source or drain of the N-type M08FET 9 is connected to GND 11 , and the oscillation stop control means 21 is connected to the gate.

The switching circuit 18 and the oscillation stop control means 21 control driving or stopping of the 011 oscillation section.

For example, in the case of FIG. 1, two different voltage level signals are sent from the 1 oscillation stop control means 21 to the P temperature MOSFET for switching.
Applied to the gate of ET19. The 1'1 pressure level signal (e.g. @1") is a P-type MO8FWT for switching.
19, this switching P-type M08FBT 19 becomes non-conductive.

Also, at this time, the P type M constituting the current cutoff control circuit n
@0" is applied to the gate of 08FET 8 through the inverter circuit, so it becomes conductive, and the N-type MOSFE
@1'' is applied to the gate of T9, making it conductive. As a result, this oscillation section is driven as a normal failure circuit.

On the other hand, from the one-shot loss stop control means 21 to the second voltage level (
For example, 10'') is applied to the gate of switching MOSFET 19, this switching P-type MOS
The FET 19 becomes conductive, and the level of the 1st oscillation input line 2 is fixed at the voltage level '1'' of the positive power supply 20 to which the source or drain of the switching P-type MOSFET 19 is connected. control circuit n
P-type MOSFET 8 and N-type MOSFET that make up
@1'@O'' is applied to the gate of ET 9, respectively, and becomes non-conductive. As a result, the oscillation section stops oscillating.

By providing this current cutoff control circuit η, the through current that conventionally flows through the single oscillation amplification inverter circuit, the seven feedback resistor transformer gate circuits, and the switching MOSFET is cut off. In the embodiment shown in FIG. 1, an attempt was made to cut off one through current by controlling the inverting circuit 4 for the oscillation width. If such a covert current cutoff control circuit η is capable of cutting off the through current, it may be set at an appropriate position on the circuit to cut off the single through current.

Next, FIG. 2, which is another embodiment, will be explained.

An oscillation amplifying inverter circuit 4B having a 2MMOSFET 34 and an N-108FET 35 is connected between an oscillation loss input line 32 connected to the crystal oscillator 31 and an oscillation output line 33. These P-type MO8FEII and N
The gate of each MOSFET 35 is connected to the oscillation input line 32, and the drain is connected to the oscillation output line 32. The source and substrate of the P-type MOSFET 34 are connected to the positive power supply 36, and the source and substrate of the N-type MOSFET 34 are connected to the GND 37.

This oscillation amplification inverter circuit 48 and the feedback resistor circuit are connected in parallel. This feedback resistor circuit includes, for example, a first conductive dissipator MO8FE'l' and a second conductive dissipator MO8FE'l'.
A feedback resistor transfer gate circuit 49 consisting of an FET is used.

(In FIG. 2, the first conductivity type is a P-type MO3FET 38, and the second conductivity type is an 8-type MOSFET 39.) The drains of the type M08FET 38 and the second conductivity type MO8FFli'l'39 are connected to the oscillation input line 32, and the sources of each are connected to the oscillation output line A. Also, the 14th electric type MO8
The IT group board is connected to the positive power supply 40, and the second conductor is connected to the type MO
The substrate of SFET 39 is connected to GND 41.

The oscillation unit, which is composed of the inverter circuit 48 for amplifying the oscillation of the crystal oscillator 31 and the transfer gate circuit 49 for the feedback resistor, can be connected to the oscillation input 2-in 321 oscillation output line 33 by connecting a capacitor to each of the crystal oscillator circuits. It operates as.

Further, a switching circuit 1 having a switching function, such as a first conductivity type MOSFET 42, is connected to the oscillation input line 32. Also, this switching ambient temperature 1 conductor t
A first terminal 45 of an oscillation stop signal control section 44 having a first terminal 45°@2 terminal 46 and a third terminal 47 is connected to the MO8B'13T 42 gate. The switching first conductor M08FET 42 is controlled by two different voltage level signals (positive voltage 11" negative voltage""O").

That is, fa'L 11! Pressure Rui No. (e.g. 10
”) is connected to the first conductivity type MO for switching via the first terminal.
When the voltage is applied to the gate of the SFET 42, the switching first conductivity type MOSFET 42 becomes conductive, and therefore the oscillation input line 32 becomes the switching first conductivity type MOSFET 42.
It is fixed at the voltage level of the positive power supply 43 to which the source and the attached plate of the OSFET 42 are connected. Furthermore, P g MO81i"E which constitutes the inverter circuit 48 for the width of the oscillation section
T-key is non-conductive, N-type M08FluT35 is conductive, and 1
The oscillation output line is fixed at the voltage level of GND 37 connected to the source and substrate of Nfi M08FET 35.

Due to this, the crystal oscillator 311 oscillation oscillation input l-
The oscillation section having the transfer gate circuit 49 and feedback resistor circuit 49 stops oscillating.

On the other hand, when the second voltage level signal (for example @1'') from the oscillation stop signal control section 44 is applied to the gate of the switching g1 conductive 111 MOSFET 42 through the first terminal 45, the first oscillation section signal line 32 and The oscillation output line is not fixed at a constant voltage level and is driven as a normal crystal oscillation circuit.By the way, when the oscillation section stops oscillating, the feedback resistor composed of two different conductivity type M08FETs is activated. Since the transformer 7 gate circuit 49 is always in a conductive state, the N-type MOSFET 35 of the oscillation amplification inverter circuit 48 which is in a conductive state, the feedback resistor transformer 7 gate circuit 49, and the
A through current flows between the positive 1 source 43 and the GND 37 via the MO8FliT42, resulting in significant power loss.

For this purpose, a second terminal 46 that outputs an inverted phase signal of the signal at the first terminal 45 and a third terminal 47 that outputs a signal in the same phase as the first terminal 45 are provided, and the second terminal 46 is connected to a transfer gate for feedback resistance. First conductivity type MOSFET 3 of circuit 49
8 and the third terminal 47 is connected to the gate of the second conductivity type MOSFET 39 of the transfer gate circuit 49 for feedback resistance, and the current path is controlled by controlling conduction and non-conduction of the transfer gate circuit 49 for feedback resistance. Cuts off the through current.

That is, since the conductivity types of the switching MOSFET 42 and the MO8FF2T3B of the feedback resistance transfer gate circuit 49 are the same, voltage level signals opposite to each other are always applied to these gates, while the switching MOSFET 42 and the feedback resistance transfer gate circuit 49 have the same conductivity type. Since the conductivity types of the MOSFETs 39 of the gate circuit 49 are different from each other, the same voltage level signal is always given to these gates.
9 is controlled, and as a result, current cutoff control becomes possible.

As described above, the oscillation stop signal control section 44 has three terminals.
(From this, positive iJ (source 43 and G
It is possible to cut off the through current flowing between the NDs 37, and it is possible to prevent significant power loss.

Note that the first oscillation stop control section 44 is a switching MOSFE.
Is it MO813T where T is P or MO8L where N type? Either ET can control the oscillation of the oscillation section.

In addition, it is possible to control conduction and non-conduction of each MOSFET of the feedback resistor transfer gate circuit 49 which is composed of two different MOSFETs. The above two examples will be explained below using FIGS. 3 and 4.

Figure 3 shows a P-type MO8F switching MOSFET.
It is a crystal oscillation circuit using 'ET.

The number 51 indicates a crystal oscillator. This crystal oscillator 51 includes an oscillation human power line 52 and an oscillation output line 5.
3 is connected. An oscillation section is connected between these oscillation input line 52 and oscillation output line 53.

The oscillation section includes an oscillation amplification inverter circuit 67 and a feedback resistor transfer gate circuit 6 connected in parallel to each other.
8.

For example, one example is used as the oscillation amplification inverter circuit 67.

fs3 Figure 1C shows P% MOSFET54 and
An inverter circuit composed of 1MON11l groups is used.

The gates of each of the P-type MOSFET 54 and the N-type MOSFET 55 are connected to the oscillation input line 52,
Each drain has an oscillation cuff. Further, the source and substrate of the P-type M08FBT 54 are connected between the positive power supply, and the source and substrate of the N g MO8IT 55 are connected to the GND 57.

The feedback resistor transfer gate circuit 6B is composed of the P type M08FFIT5B and the N type Mospg'r shown in FIG.
A circuit constructed from s9 is used.

The drains of the two-layer MOSFET 58 and the N-channel MOSFET 59 are connected to the oscillation power line 52, the sources are connected to the oscillation cuff, and the substrate of the P-type MOSFET 58 is connected to the positive power source ω.

The substrate of N-type M08FBT59 is connected to GND 61.

As is clear from FIG. 3, a switching circuit 70 having a switching function is connected to the single oscillation type signal line 52. For example, a switching P-type M08FET 62 is used as the switching circuit 70. P type MO8
The drain and source of FlflT62 are each connected to one oscillation unit line 52. It is connected to the positive power supply 63.

Also, the board of P W MOSFET 62 is connected to the positive power supply 63.
connected to.

Moreover, the switching P fi MOSFET 62
A one-oscillation stop control means 64 is connected to the gate of the oscillation stop control means 64.

These switching circuits 70 and oscillation stop control means 64
The driving and stopping of the oscillating section is controlled by the oscillating section. For example, in the case of the embodiment shown in FIG. 3, two different voltage level signals are applied from the oscillation stop control circuit itself to the gate of the switching P-type M08FET 62, as in FIG.

When the @1 voltage level signal (e.g. "o") is applied to the gate of the switching MO8FgT62, the switching MO8IT62 becomes conductive and the level of the single oscillation type line 52 changes to the switching MOSFET6.
Voltage level 6 of positive power supply 63 to which source 2 is connected
At this time, the N-type MOSFET 55 constituting the oscillation amplification inverter circuit 67 becomes conductive, and the level of the single oscillation output voltage becomes N-type MOSFET 55.
Connected to the source of FET 55, GND
57 voltage level @0''.

As a result, the oscillation of the oscillation unit including the crystal oscillator 511, the oscillation layer inverter circuit, and the melt speed resistance circuit 69 stops.

On the other hand, when the second voltage level signal (for example @1'') is applied to the gate of the switching MOSFET 62, the switching MOSFET 62
62 becomes non-conductive. At this time, 1 oscillation person Kaline 52
The voltage level of the oscillation output line 53 is not fixed, and one oscillation section is driven as a normal crystal oscillation circuit.

However, when the oscillation of the former oscillation section is stopped, a through current flows through the current path consisting of GND 5T, the feedback resistor transfer gate circuit 69, and the positive power supply 63 of the switching circuit 70. By providing the control circuit 69, this through current will no longer flow. By the way, in one embodiment of the present invention, the crystal oscillation circuit shown in FIG. 3 is provided with a current cutoff control circuit 69, as is clear from the figure.

When this current cutoff control circuit 69 stops the oscillation of the first oscillation section, 'ttyI! i Cut off the current.

That is, the current cutoff control circuit having the oscillation stop control means 64 shown in FIG. Controls conduction and non-conduction of P-type MO8-FET 5B and N W MO81i'lD'I' 59. When the oscillation section is in a normal oscillation state (that is, when the signal from the oscillation stop control means 64 is at a positive voltage level)
The current cutoff control circuit 69 applies a negative voltage level signal @O'', which is obtained by inverting the phase of the signal from the 1-oscillation stop control means 64 via the inverter circuit 6, to the gate of the P-type MOSFET 5B in the feedback resistor transfer gate circuit section. Then, a positive voltage level signal from the oscillation stop control means 64 is applied to the gate of the N-type M08FgT59.

On the other hand, when the oscillation section is in a stopped state (that is, when the signal from the one-oscillation stop control means 64 is at a negative voltage level), the flow rate cutoff control circuit 69 controls the feedback resistor transfer gate circuit section so that the current is cut off. A positive voltage level k lq , '4 ``1'' is applied to the gate of type M08FET 5B by inverting the phase of the signal from the oscillation stop control means via the inverter circuit 65.
Full application L/, N W MO8FnT59 (7) A negative voltage level signal "0" from the oscillation stop control means 64 is applied to the gate.

In this way, 1! has an oscillation stop control means! By providing a flow cutoff control circuit 69, when one oscillation is stopped.

No through current flows through the current path formed by the oscillation amplification inverter circuit 67, the feedback resistor transfer gate circuit 68, and the switching circuit 70, and significant power loss can be prevented.

Unlike the P-type M08FBT62 used as the switching circuit 70 in the diagram on page 43, FIG. I am using JMO8FICT 80. The source and drain of this N@MO8IT 8o are connected to the oscillation input line 52 and GND 81, respectively. or.

At the gate of the switching N-type MOSFET 80.

Oscillation stop control means 64 is connected. These switching circuit sections and oscillation stop control means 64 (from ζ).

Driving or stopping of the early oscillation section is controlled. Similar to FIG. 3, two different voltage level signals are applied to the gate of the switching MOSFET 80 from the example of the 9 oscillation stop control means.
) to be spoken about.

The first voltage level signal (e.g. "") is used for switching M
When applied to the gate of OSFET 80, this switching M08FFiT 80 becomes non-conductive.

At this time, each voltage level of the oscillating unit 52 and the oscillating unit 52 is not fixed, and one oscillating unit is driven as a normal crystal oscillation circuit.

On the other hand, when a second voltage level signal (for example @1'') is applied from the first oscillation stop control means to the gate of the switching MO8FgT80, this switching MO8-FET
80 becomes conductive, and the level of the first oscillation unit line 52 is fixed to the voltage level 10'' of GND 81 to which the source of the switching MOSFET 80 is connected.

Also, at this time, the inverter circuit 67 for one oscillation part width is configured, and the P-type M08FET 54 becomes conductive, and the level of the one-oscillation output cut-in & is set to the voltage level 10'' of the positive power supply line connected to the source of the P-type MOSFET 54. Fixed.

As a result, the oscillation of the oscillation unit composed of the crystal oscillator 511, the oscillation-side inverter circuit 67, and the feedback resistor circuit 38 stops oscillating.

The current cutoff control circuit 84 having the oscillation stop control means B shown in FIG. N type MOS F E T2O
Controls conduction and non-conduction. This current cutoff control circuit mix occurs when the 1st oscillation section is in the normal oscillation state (that is, when the signal from the 1st oscillation stop control means is at a positive voltage level @1'').
Feedback resistor transformer circuit section - gate circuit simple N type M08F
A positive voltage level 11'' is applied to the gate of ET 59 and to the gate of P-type M03FET 58.

The signal from the oscillation stop control means B is transferred to the inverter circuit 82.
A phase-inverted negative voltage level "" is applied through the terminal. As a result, the N-type MOSFET 59 and P-type MOSFET that constitute the transfer gate circuit 68 for feedback resistance
T58 is in a conductive state. On the other hand, when the oscillation section is in a stopped state (that is, when the signal from the oscillation stop control means 64 is at a negative voltage level), the i! current cutoff control circuit 84 operates a transfer gate circuit for a feedback resistor so that the current is cut off. A positive voltage level is applied to the gate of N-type MOSFET 59 in the
0' is applied to the gate of the P-type MO8-FET 58, and a positive voltage level @1'', which is obtained by inverting the phase of the signal from the oscillation stop control means via the inverter circuit 82, is applied to the gate of the P-type MO8-FET 58.

As a result, a transfer gate circuit section for feedback resistor is formed.Te1. Nru NfiMOSFET59 and HiPfiMOS
The FET pin becomes non-conductive.

By providing the current cutoff control circuit 84 having the oscillation stop control means diagram in this manner, when one oscillation is stopped.

Inverter circuit 67 for oscillation amplification, transfer gate circuit section for feedback resistance, and N-type M08FgT for switching
No through current flows through the current path formed by 80, and significant power loss can be prevented.

Also, the oscillation amplification inverter circuit and transfer gate circuit used in FIGS. 3 and 4 are as follows.

Since it is equivalent to a conventional crystal oscillation circuit, it is easy to set one circuit constant, and the conventional rooting accuracy can be maintained. Furthermore, since the number of elements is kept to a minimum, the area occupied by the chip when integrated into an integrated circuit is not increased.

In addition, the oscillation section consisting of the inverme circuit for amplifying one oscillation of the crystal oscillator and the transfer gate circuit for the feedback resistor shown in Figs. Drive as an oscillation circuit.

〔Effect of the invention〕

According to the present invention, it is possible to provide a crystal oscillation circuit that can interrupt the through current generated when one oscillation is stopped and prevent power loss with an extremely simple circuit configuration.

[Brief explanation of drawings]

Figure 1 is a crystal oscillation circuit diagram, M2, which is an embodiment of the present invention.
The figure is a crystal oscillation circuit diagram which is another embodiment of the present invention.
4 and 4 are crystal oscillation circuit diagrams showing a specific example of FIG. 2,
5 and 6 are conventional diagrams of crystal oscillation circuits. 1...Crystal oscillator. 2...Oscillation input line. 3...Oscillation output line. 4...Inverting circuit for oscillation amplification. 5...Feedback resistance circuit. 6 , 8 , 12.19 , , P M MO8IE
T7.9.13...N-type MOf9FET. 10, 15.16.20...Positive power supply. 11, 14.17...GND. 18...Switching circuit. 21...Oscillation control means. n...Current cutoff control circuit.

Claims (2)

[Claims] (1) Oscillation having an oscillation input line and an oscillation output line connected to a crystal oscillator, and an oscillation amplification inverting circuit and a feedback resistance circuit connected in parallel between the oscillation input line and the oscillation output line, respectively. and is connected to the oscillation input line, and when the oscillation section is brought into an oscillation state,
A switching circuit connected to this switching circuit, which sets the level of this oscillation input line to a second level when the level of this oscillation input line is set to a first level and the first oscillation section is stopped. an oscillation stop control means for making conductive or non-conductive; and when the oscillation section stops oscillating due to the oscillation control means and the switching circuit, the oscillation stop control means is formed in the oscillation amplification inverting circuit, the feedback resistor circuit, and the switching circuit. 1. A crystal oscillation circuit comprising: a current cutoff control circuit that operates to prevent current from flowing in a current path. (2) An oscillation input line and an oscillation output line connected to the crystal oscillator, an oscillation amplification inverter circuit connected between the oscillation input line and the oscillation output line, and a parallel connection to the oscillation amplification inverter circuit. a feedback resistance transfer gate circuit comprising a first conductivity type MOSFET and a second conductivity type MOSFET different from the first conductivity; a first conductivity type switching MOSFET whose drain is connected to the oscillation input line; A first terminal is connected to the gate of the first conductivity type switching MOSFBT, and an oscillation stop signal control section having a second terminal and a third terminal, and a gate connected to the second terminal of the oscillation stop signal control section. and a gate is connected to a first conductivity type MOSFET of the feedback resistor transfer gate circuit to which an inverted phase signal of the signal of the first terminal is sent, and a third terminal of the oscillation stop signal control section; A crystal oscillation circuit comprising: a second conductivity type MOSFET of the feedback resistor transfer gate circuit to which a signal having the same phase as the signal is sent.