Applied voltage control circuit for voltage controlled oscillation circuit
一种电压控制振荡、外加电压的技术，应用在功率振荡器、电气元件、发生器的起振等方向，能够解决PMOS晶体管同时导通、不可能、控制端口过载等问题
Inactive Publication Date: 2006-10-11
PANASONIC CORP
View PDF1 Cites 5 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
As a first problem, this raises the possibility that the "H" level of a general-purpose port controlled by an LSI or an external microcomputer may not comply with the minimum allowable value of the "H" level for identifying a transmission gate
Therefore, the transmission gate cannot be turned on after the oscillation is stabilized, which makes the control by the voltage control terminal impossible
[0008] As a second problem, when the transmission gate and the gate of the PMOS transistor are switched immediately after the power supply is gated and the oscillation is stabilized, due to influences such as the delay of the inverter caused by the inversion of the signal, there will be Generates a period during which the PMOS transistor and the transmission gate are turned on simultaneously
As a result, the power supply voltage is applied to the voltage control terminal, which may cause overloading of the control port of the LSI or an external microcomputer
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0068] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0069] first preferred embodiment
[0070] figure 1 is a circuit diagram showing the structures of the applied voltage control circuit 10 and the voltage control oscillation circuit 100 for the voltage control oscillation circuit according to the first preferred embodiment of the present invention.
[0071] will not be described below to resemble Figure 10 The voltage controlled oscillator circuit 100 configured in the manner shown in the conventional art.
[0072] The applied voltage control circuit 10 includes, as main components, a first transfer gate G1, a second transfer gate G2, and an NPN transistor QN1 for switching an applied voltage. The first transfer gate G1 determines the application / disconnection of the power supply voltage VDD with respect to the control input terminal n3 of the voltage-controlled oscillation circuit 100 . The second transf...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
When a power supply is turned on, an NPN transistor is disconnected, a first transmission gate is conducted, a second transmission gate is disconnected, and a power-supply voltage is applied to a control input terminal of a voltage controlled oscillation circuit via the first transmission gate. After oscillation of a quartz resonator is stabilized, the NPN transistor is switched to the conducted state by a control signal applied to a general purpose terminal so that the first transmission gate is switched to the disconnected state, and the second transmission gate is switched to the conducted state. Then, a voltage of the voltage control terminal is applied to the control input terminal of the voltage controlled oscillation circuit via the second transmission gate.
Description
technical field [0001] The present invention relates to an applied voltage control circuit for a voltage controlled oscillation circuit (VCO), and is effectively applied to an applied voltage control circuit for a voltage controlled oscillation circuit controllable by an external microcomputer, LSI, or the like. Further, the present invention is also applicable to circuits generally used for switching in and out of the voltage when the supply voltage is gated and the voltage after the supply voltage is gated. Background technique [0002] Figure 10 The shown conventional voltage-controlled oscillation circuit 100 includes: a quartz resonator X connected between a terminal n1 and a terminal n2, a capacitor C1 and a voltage-controlled varactor diode (voltage variable capacitance) connected in series between the terminal n1 and ground GND. Varactor diode) VC1, connected in series between capacitor C2 and voltage-controlled variable-capacitance diode VC2 between terminal n2 and...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/32
CPCH03B5/06H03B5/366H03L3/00
Inventor 松本宪一
Owner PANASONIC CORP