Low voltage compensator for power supply in a complementary MOS transistor crystal oscillator circuit

• US 4,131,864 A
• Filed: 06/30/1977
• Issued: 12/26/1978
• Est. Priority Date: 07/01/1976
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Kumata, Kiyoshi, Yamamoto, Keizo, Kuzumoto, Takatoshi
• Primary Examiner(s): Kominski, John
• Application Number:
  US05/811,860
• Time in Patent Office: 544 Days
• Field of Search: 331/108 D, 331/116 R, 331/64, 58/23
• US Class Current: 331/116.0FE
• CPC Class Codes: G04F 5/06 using piezoelectric resonators
• CPC Class Codes: G04G 9/0017 in which the light emitting display elements may be activated at will or are controlled in accordance with the ambient light

Abstract

A resistor is connected to the source of a C-MOS inverter included within a crystal oscillator circuit in order to reduce the power dissipation in the crystal oscillator circuit. A switching transistor is connected in parallel to said resistor, said switching transistor being responsive to an LED display switch for enabling LED display or an illumination lamp switch for illuminating a liquid crystal display. The switching transistor shunts the resistor in response to actuation of the LED display switch or the illumination lamp.

Claims

1. In a complementary MOS transistor crystal oscillator circuit including two power supply terminals, a C-MOS inverter connected across said two power supply terminals, a quartz crystal vibrator connected between an input terminal and an output terminal of the C-MOS inverter, a first source resistor connected between the source of the N-channel transistor of the C-MOS inverter and one of said two power supply terminals, and a second source resistor connected between the source of the P-channel transistor of the C-MOS inverter and the other of said two power supply terminal, the improvement comprising:

a first switching means connected in parallel to the first source resistor;

a second switching means connected in parallel to the second source resistor;

a control means for causing the conduction of said first and second switching means; and

an enabling means for operating the control means.

2. The complementary MOS transistor crystal oscillator circuit as set forth in claim 1, wherein the enabling means is an actuating switch for enabling an LED display associated with said complementary MOS transistor crystal oscillator circuit.

3. The complementary MOS transistor crystal oscillator circuit as set forth in claim 1, wherein the enabling means is an illumination lamp switch for exciting an illumination lamp of a liquid crystal display which is associated with said complementary MOS transistor crystal oscillator circuit.

4. The complementary MOS transistor crystal oscillator circuit as set forth in claim 1, wherein the first switching means is an N-type transistor, and the second switching means is a P-type transistor.

5. In a complementary MOS transistor crystal oscillator circuit including two power supply terminal, a C-MOS inverter connected across said two power supply terminals, a quartz crystal vibrator connected between an input terminal and an output terminal of the C-MOS inverter, and a source resistor connected between the source of a transistor of the C-MOS inverter and one of said power supply terminals, the improvement comprising:

a switching means connected in parallel to the source resistor;

a control means for developing a control signal for causing the conduction of said switching means; and

an enabling means for activating the control means to develop said control signal, said enabling means including an actuating switch for activating an LED display which displays information correlated to said complementary MOS transistor crystal oscillator circuit.

6. In a complementary MOS transistor crystal oscillator circuit including two power supply terminals, a C-MOS inverter connected across said two power supply terminals, a quartz crystal vibrator connected between an input terminal and an output terminal of the C-MOS inverter, and a source resistor connected between the source of a transistor of the C-MOS inverter and one of said power supply terminals, the improvement comprising:

a switching means connected in parallel to the source resistor;

a control means for developing a control signal for causing the condition of said switching means; and

an enabling means for activating the control means to develop said control signal, said enabling means including an illumination lamp switch for exciting an illumination lamp of a liquid crystal display which displays information correlated to said complementary MOS transistor crystal oscillator circuit.