KR19990049646A - Operating power supply device of RF module - Google Patents

Abstract

The present invention relates to a device for applying an operating power of an RF module for eliminating waste of operating power supplied to an RF module to increase the battery usage time of a mobile phone. The present invention relates to a power supply source for supplying driving power to a device of an RF module. and; A regulator for keeping the voltage of the power supply source constant at a predetermined value; A PLL for generating a lock detection signal in a reception standby state to find a received channel; Switching means connected between a regulator and a device of an RF module excluding the PLL and operated by a lock detection signal; And a PLL driving power supply for supplying a voltage to operate the PLL. The present invention does not apply the operating power of the mobile phone RF module during the channel change, it is possible to increase the use time of the device by reducing the power consumption of the mobile phone.

Description

Operating power supply device of RF module

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying an operating power of a radio frequency (Module) module, the operation of a lock detection signal of a phase-locked loop (PLL) used in a frequency synthesizer in an RF module of a mobile phone. Method to apply operating power of RF module using lock detection signal of PLL to increase battery usage time by controlling the power supply of other devices of RF module except PLL when cell phone is not locked will be.

1 is a block diagram illustrating an RF module for explaining the operation of a cellular phone RF module.

1 shows an antenna 1, a duplexer 2, a primary mixer 3, a secondary mixer 4, an FM detector 5, and a secondary local oscillator ( 6), a receiving VCO (voltage controlled oscillator) 7, a PLL 8, a transmitting VCO (voltage controlled oscillator) 9, and a power amplifier 10.

Referring to the operation of the RF module configured as described above, the receiving end receives the first local oscillation frequency in which the receiving carrier enters the first mixer through the antenna 1 and the duplexer 2 and is higher than the receiving carrier frequency. The VCO 7 is used to input to the primary mixer 3 to produce a first intermediate frequency that differs by the frequency difference between the primary carrier and the primary local oscillation frequency generated at the receiving VCO 7. And stabilize it, and then input it to the secondary mixer 4 together with the oscillation frequency output of the secondary local oscillator 6 to generate a secondary intermediate frequency where it is demodulated to the original signal in the FM detector. To print.

In addition, the transmitting end inputs the frequency signal to be modulated to the transmission VCO (9) to the carrier frequency modulated signal generated by the power amplifier 10 to amplify the power level and then filtered in the duplexer (2) and then antenna Transmit via (1).

The DC power applied to the RF module operating as described above in the cellular phone applies DC power to the transmitting end and the receiving end in a call state, and does not supply power to the transmitting end in the standby state (that is, only the receiving end operates). This is also true for other cordless phones.

The mobile phone communicates by designating one of many channels set at regular frequency intervals, and assigns a transmission channel and a reception channel among the empty channels in the operating frequency band. Therefore, PLL frequency synthesizers are adopted that can vary the output frequency at regular frequency intervals according to channel assignment.

However, in a mobile phone using a PLL frequency synthesizer, a conventional RF module operating power supply device has a delay in changing a carrier frequency from one channel to another channel at an indirect frequency using a PLL, and during this delay, the RF module communicates. Can't give or receive Nevertheless, there is a problem that the DC power is applied to the RF module to consume power of the mobile phone.

Therefore, the present invention has been made to solve such a problem, and an object of the present invention is to waste the operation power supplied to the RF module by controlling the application of the operating power of the RF module using the operation of the lock detection signal of the PLL. Is to increase the battery life of the phone.

The present invention for achieving the above object is a power supply for supplying a drive power to the device of the RF module; A regulator for keeping the voltage of the power supply source constant at a predetermined value; A PLL for generating a lock detection signal in a reception standby state to find a received channel; Switching means connected between a regulator and a device of an RF module excluding the PLL and operated by a lock detection signal; And a PLL driving power supply for supplying a voltage to operate the PLL.

The present invention does not apply the operating power of the RF module of the mobile phone while the channel is changed by using the switching operation of the transistor, so that the power consumption of the mobile phone can be reduced to increase the use time of the device.

1 is a block diagram of an RF-module.

Figure 2 is a block diagram showing an operating power supply device of the RF module according to the present invention.

3 is a block diagram of a PLL generating a lock detection signal in a reception standby state.

4 is a timing chart of a power supply which has passed through a lock detection signal of a PLL and a transistor;

<Explanation of symbols for main parts of the drawings>

20: power supply 30: regulator

40: PLL 41: Prescaler

42: dispenser 43: phase detector

44: reference oscillator 45: lock detector

46: control circuit 47: lock detection output terminal

50: switching means 60: power supply line

70: PLL driving power supply

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 illustrates a configuration diagram of an RF-module power supply device for supplying power to an RF-module except for a PLL by using a lock detection signal of a PLL.

As shown in FIG. 2, the apparatus for applying operating power of an RF module according to the present invention includes a power supply source 20 for driving a circuit, a regulator 30 for maintaining a constant voltage, and a PLL for generating a lock detection signal. 40, a switching means 50 having a switching action, a power supply line 60 connected to a device other than the PLL 40, and a PLL driving power supply 70 for driving the PLL 40.

The operation of the operation power applying device of the RF module provided as described above will be described.

First, when the PLL driving power supply 70 is applied to the PLL 40, while the frequency synthesizer is changing the channel to find the received channel in the reception standby state, the PLL 40 has a high level lock detection when the channel is fixed. A signal is output, and a low level lock detection signal is output when the channel changes.

FIG. 3 illustrates a PLL generating a lock detection signal when a channel is switched in a reception standby state.

As shown in FIG. 3, the PLL 40 includes a prescaler 41, a divider 42, a phase detector 43, a reference oscillator 44, a lock detector 45, and a control circuit 46. ) And the lock detection output terminal 47.

The operation of the PLL 40 configured as described above will be described.

The oscillation frequency generated at the receiving VCO stage is divided into 1 / M in the prescaler 41 and divided into 1 / N in the divider 42, applied to the phase detector 43, and generated by the reference oscillator 44. When the oscillation frequency is applied, a frequency matched to the channel is generated by the phase detector 43 and input to the receiving VCO stage. At this time, the lock detector 45 detects a state in which the phase detector 43 is locked to lock detection signals. Generates. The frequency divider 42 changes the channel in stages by varying the frequency dividing coefficient N by the control circuit 46.

4 shows the waveform of the lock detection signal output to the LDT 47 of the PLL 40 and the waveform of the voltage output from the switching means 50.

3 to 4, an operation of the operation power applying device of the RF module according to the present invention will be described as an embodiment.

The voltage signal of the power source 20 is kept constant at a value determined by the regulator 30 and applied to the switching means 50. In addition, when the PLL driving power supply 70 is applied to the PLL 40, the mobile phone changes the channel to find the frequency signal received in the reception standby state using a frequency synthesizer using the PLL 40. At this time, the PLL 40 ) Outputs a lock detection signal of a high level when the channel is fixed, and applies a lock detection signal inverted to a low level to the switching means 50 while the channel is changed, which is a waveform as shown in FIG. It is used as a signal for controlling the switch operation of the switching means 50.

The switching means 50 is turned off when the lock detection signal is at a high level so that the power supply 20 is not applied to the device of the RF module except for the PLL, but when the lock detection signal is at the low level, it is energized to apply a voltage to the device. It appears as a waveform like b. The transistor 50 repeatedly performs the above operation while the channel is changed in the standby state of the cellular phone.

Since the present invention supplies the operating power of the RF module through the lock detection output terminal of the PLL, the operating power only when the channel is fixedly selected without supplying the power Vcc during the variable delay time of the channel using the locking operation of the PLL. The power consumption can be reduced by supplying the circuit to the circuit, thereby increasing the service life of the device.

Claims (3)

A power supply source 10 for supplying driving power to the device of the RF module; A regulator 20 for maintaining a constant voltage at the power supply source 10 at a predetermined value; A PLL 30 for generating a lock detection signal in a reception standby state to find a received channel; Switching means (50) connected between the regulator (20) and devices of the RF module other than the PLL (30) and operated by the lock detection signal; And a PLL driving power supply (70) for supplying a voltage to operate the PLL (30). The method of claim 1, wherein the switching means 50 is one of a switching element such as a transistor, a thyristor, etc., the input terminal to the output terminal of the regulator 30, the output terminal to the input terminal of the device of the RF module excluding the PLL And the control terminal is configured to be connected to the lock detection signal output terminal of the PLL (40). The apparatus of claim 1, wherein the PLL has an independent driving power source.