JP2002325026A - Control circuit for receiving filter in portable telephone device and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always use a receiving filter in a portable telephone device in an optimal state without deteriorating the characteristics of the filter due to temperature change or secular change. SOLUTION: A control unit 102 is provided with a reference frequency signal output, an adjusted state holding power source output, a power source output, and an adjustment start signal. The reference frequency signal input of a receiving filter part 101 is connected to the output of the reference frequency signal of the control unit 102. The adjusted state holding power source input of the receiving filter 101 is connected to the output of the adjusted state holding power source of the control unit 102. The power source input of the receiving filter part 101 is connected to the output of the power source of the control part 102. The adjustment start signal input of the receiving filter part 101 is connected to the output of the adjustment start signal of the control unit 102.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit and a control method of a reception filter in a portable telephone device, and more particularly, to an active filter of this type in a portable telephone device because its characteristics fluctuate due to a temperature change or the like. The present invention relates to a control circuit and a control method when adjustment is necessary and such a filter is used in a digital portable telephone device.

[0002]

2. Description of the Related Art A reception filter in a portable telephone device is:
Conventionally, it was configured using passive elements.

However, such a filter has a large shape and is not suitable for miniaturization of a portable telephone device.

In recent years, as a solution to such a problem,
Means for realizing integration and miniaturization by using active elements is disclosed.

A portable telephone device using this active element is disclosed in, for example, JP-A-6-318843 and JP-A-6-15.
No. 2320, JP-A-6-318832, JP-A-8-79008, JP-A-8-125492, JP-A-8-204504, JP-A-10-28
No. 4,899, and the like.

Further, such a filter adjusting means is
For example, JP-A-9-83294, JP-A-10-30
No. 3699 and the like.

FIG. 9 is a block diagram of a conventional portable telephone device using an active filter as a reception filter.
0 shows an example of the control timing in the conventional circuit.

[0008]

However, the filters disclosed in the above publications have a problem that the filter characteristics deteriorate due to temperature fluctuations and aging.
It is necessary to adjust the characteristic variation sequentially.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and accordingly, an object of the present invention is to provide a receiving filter for a portable telephone device capable of solving the above-mentioned problems inherent in the prior art. It is to provide a new control circuit and a new control method.

[0010]

In order to achieve the above object, a control circuit for a reception filter in a portable telephone device according to the present invention comprises a reference frequency signal input, an adjustment state holding power supply input, a power supply input, and an adjustment start signal input. Comprising a configuration having
Adjusting the characteristics of the filter with reference to the reference frequency signal, the adjustment state holding power supply is connected to an adjustment circuit, can hold the adjustment state while the power supply is supplied, by the power supply The filter operation is performed, the adjustment operation is started at the rising edge of the adjustment start signal, and the power is supplied. After the time required for adjusting the reception filter has elapsed since the start of the adjustment operation, the adjustment is completed, and from the initial state,
The number of repetitive adjustments until the adjustment stabilizes to the optimal state is N
(N is a positive integer) In the portable telephone device having a reception filter unit, the control unit has a reference frequency signal output, an adjustment state holding power supply output, a power supply output, and an adjustment start output, and the reception filter unit The reference frequency signal input of the control unit is connected to the output of the reference frequency signal of the control unit, the adjustment state holding power supply input of the reception filter unit is connected to the output of the adjustment state holding power supply of the control unit, the reception filter The power input of the unit is connected to an output of the power of the control unit, and the adjustment start signal input of the reception filter unit is connected to an output of the adjustment start signal of the control unit.

The control circuit of the receiving filter in the portable telephone device according to the present invention further includes a configuration having a reference frequency signal input, an adjustment state holding power supply input, a power supply input, and an adjustment start signal input. The characteristic of the filter is adjusted, the adjustment state holding power supply is connected to an adjustment circuit, and can maintain the adjustment state while the power supply is being performed. The adjustment operation is started at the rising edge of the start signal, and the power is supplied, and after a lapse of time until the circuit is stabilized after the power is supplied, the circuit is stabilized, and the adjustment operation of the filter is started. After the time required for the adjustment of the reception filter has elapsed, the adjustment is completed, and the number of repetition adjustments from the initial state to the stable state until the adjustment is stabilized is N (N is The control unit has a reference frequency signal output, an adjustment state holding power output, a power supply output, and an adjustment start output, and the reference frequency of the reception filter unit. A signal input connected to an output of the reference frequency signal of the control unit; an adjustment state holding power supply input of the reception filter unit connected to an output of an adjustment state holding power supply of the control unit; An input is connected to an output of the power supply of the control unit, and the adjustment start signal input of the reception filter unit is connected to an output of the adjustment start signal of the control unit. And the power supply is shared with the power supply to the PLL circuit.

[0012] The control circuit of the receiving filter in the portable telephone device according to the present invention further has a configuration having a reference frequency signal input, an adjustment state holding power supply input, a power supply input, and an adjustment start signal input, and the reference frequency signal is used as a reference. The characteristic of the filter is adjusted, the adjustment state holding power supply is connected to an adjustment circuit, and can maintain the adjustment state while the power supply is being performed. The adjustment operation is started at the rising edge of the start signal, and the power is supplied, and after a lapse of time until the circuit is stabilized after the power is supplied, the circuit is stabilized, and the adjustment operation of the filter is started. The adjustment is completed after the time required for the adjustment of the reception filter has elapsed, and the number of repetitive adjustments from the initial state to the stable state until the adjustment is stabilized is N (N is The control unit has a reference frequency signal output, an adjustment state holding power output, a power supply output, and an adjustment start output, and the reference frequency of the reception filter unit. A signal input connected to an output of the reference frequency signal of the control unit; an adjustment state holding power supply input of the reception filter unit connected to an output of an adjustment state holding power supply of the control unit; An input is connected to an output of the power supply of the control unit, and the adjustment start signal input of the reception filter unit is connected to an output of the adjustment start signal of the control unit. Wherein the reference frequency signal is shared with a reference frequency signal to a PLL circuit.

The control circuit of the reception filter in the portable telephone device according to the present invention has a configuration having a reference frequency signal input, an adjustment state holding power supply input, a power supply input, and an adjustment start signal input, and the reference frequency signal is used as a reference. The characteristic of the filter is adjusted, the adjustment state holding power supply is connected to an adjustment circuit, and can maintain the adjustment state while the power supply is being performed. The adjustment operation is started at the rising edge of the start signal, and the power is supplied, and after a lapse of time until the circuit is stabilized after the power is supplied, the circuit is stabilized, and the adjustment operation of the filter is started. The adjustment is completed after the time required for the adjustment of the reception filter has elapsed, and the number of repetitive adjustments from the initial state to the stable state until the adjustment is stabilized is N (N is The control unit has a reference frequency signal output, an adjustment state holding power output, a power supply output, and an adjustment start output, and the reference frequency of the reception filter unit. A signal input connected to an output of the reference frequency signal of the control unit; an adjustment state holding power supply input of the reception filter unit connected to an output of an adjustment state holding power supply of the control unit; An input is connected to an output of the power supply of the control unit, and the adjustment start signal input of the reception filter unit is connected to an output of the adjustment start signal of the control unit. Wherein the adjustment control signal is shared with power supply to a receiving circuit.

A method for controlling a reception filter in a portable telephone device according to the present invention has a configuration having a reference frequency signal input, an adjustment state holding power supply input, a power supply input, and an adjustment start signal input, and a filter is provided based on the reference frequency signal. The adjustment state holding power supply is connected to an adjustment circuit, and can hold the adjustment state while the power supply is being performed. The adjustment operation is started at the rising edge of the signal, and the power is supplied. After the time until the circuit is stabilized after the power is supplied, the circuit is stabilized, and the reception is performed after the adjustment operation of the filter is started. After the time required for the filter adjustment has elapsed, the adjustment is completed, and the number of repetitive adjustments from the initial state until the adjustment is stabilized to the optimum state is N (N is a positive number). The control unit has a reference frequency signal output, an adjustment state holding power output, a power supply output, and an adjustment start output, and the reference frequency signal of the reception filter unit. An input is connected to the output of the reference frequency signal of the control unit, the adjustment state holding power supply input of the reception filter unit is connected to an output of the adjustment state holding power supply of the control unit, and the power supply input of the reception filter unit. Is connected to the output of the power supply of the control unit, and the adjustment start signal input of the reception filter unit is connected to the output of the adjustment start signal of the control unit. During standby for intermittent operation, adjustment is performed immediately before the reception timing for each intermittent return operation, and power is constantly supplied to maintain the adjustment state. A number signal is input, the power is subsequently supplied, the adjustment start signal is input, and after the reception is completed, the reference frequency signal, the power supply, and the adjustment start signal are turned “OFF”. It is characterized by:

[0015] The method of controlling a reception filter in a portable telephone device according to the present invention further comprises a configuration having a reference frequency signal input, an adjustment state holding power supply input, a power supply input, and an adjustment start signal input. The characteristic of the filter is adjusted, the adjustment state holding power supply is connected to an adjustment circuit, and can maintain the adjustment state while the power supply is being performed. The adjustment operation is started at the rising edge of the start signal, and the power is supplied, and after a lapse of time until the circuit is stabilized after the power is supplied, the circuit is stabilized, and the adjustment operation of the filter is started. The adjustment is completed after the time required for the adjustment of the reception filter has elapsed, and the number of repetitive adjustments from the initial state to the stable state until the adjustment is stabilized is N (N is The control unit has a reference frequency signal output, an adjustment state holding power output, a power supply output, and an adjustment start output, and the reference frequency of the reception filter unit. A signal input connected to an output of the reference frequency signal of the control unit; an adjustment state holding power supply input of the reception filter unit connected to an output of an adjustment state holding power supply of the control unit; An input is connected to an output of the power supply of the control unit, and the adjustment start signal input of the reception filter unit is connected to an output of the adjustment start signal of the control unit. When performing a communication operation, adjustment is performed immediately before the reception timing for each frame.

The method of controlling a reception filter in a portable telephone device according to the present invention further comprises a configuration having a reference frequency signal input, an adjustment state holding power supply input, a power supply input, and an adjustment start signal input, and the reference frequency signal is used as a reference. The characteristic of the filter is adjusted, the adjustment state holding power supply is connected to an adjustment circuit, and can maintain the adjustment state while the power supply is being performed. The adjustment operation is started at the rising edge of the start signal, and the power is supplied, and after a lapse of time until the circuit is stabilized after the power is supplied, the circuit is stabilized, and the adjustment operation of the filter is started. The adjustment is completed after the time required for the adjustment of the reception filter has elapsed, and the number of repetitive adjustments from the initial state to the stable state until the adjustment is stabilized is N (N is The control unit has a reference frequency signal output, an adjustment state holding power output, a power supply output, and an adjustment start output, and the reference frequency of the reception filter unit. A signal input connected to an output of the reference frequency signal of the control unit; an adjustment state holding power supply input of the reception filter unit connected to an output of an adjustment state holding power supply of the control unit; An input is connected to an output of the power supply of the control unit, and the adjustment start signal input of the reception filter unit is connected to an output of the adjustment start signal of the control unit. In addition, adjustment is performed immediately after an idle slot during continuous reception.

The method of controlling a reception filter in a portable telephone device according to the present invention further includes a configuration having a reference frequency signal input, an adjustment state holding power supply input, a power supply input, and an adjustment start signal input, and using the reference frequency signal as a reference. The characteristic of the filter is adjusted, the adjustment state holding power supply is connected to an adjustment circuit, and can maintain the adjustment state while the power supply is being performed. The adjustment operation is started at the rising edge of the start signal, and the power is supplied, and after a lapse of time until the circuit is stabilized after the power is supplied, the circuit is stabilized, and the adjustment operation of the filter is started. The adjustment is completed after the time required for the adjustment of the reception filter has elapsed, and the number of repetitive adjustments from the initial state to the stable state until the adjustment is stabilized is N (N is The control unit has a reference frequency signal output, an adjustment state holding power output, a power supply output, and an adjustment start output, and the reference frequency of the reception filter unit. A signal input connected to an output of the reference frequency signal of the control unit; an adjustment state holding power supply input of the reception filter unit connected to an output of an adjustment state holding power supply of the control unit; An input is connected to an output of the power supply of the control unit, and the adjustment start signal input of the reception filter unit is connected to an output of the adjustment start signal of the control unit. It is characterized in that pre-adjustment is performed when the power of the mobile phone device is turned on.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described in detail with reference to the drawings.

A first feature of the present invention is that the characteristic is adjusted immediately before the reception timing for each intermittent return operation at the time of standby for performing the intermittent operation. Power is constantly supplied to maintain the adjustment state.

First, input of a reference frequency signal. Second, supply of power. Third, input of an adjustment start signal. A second feature of the present invention is that reception is performed for each frame when a communication operation is performed. Adjust the characteristics just before the timing.

A third feature of the present invention is that the characteristics are adjusted immediately after an idle slot during continuous reception.

A fourth feature of the present invention is that the power supply is controlled by a PLL.
Shared with power supply to circuit. That is, the reference frequency signal is shared with the reference frequency signal to the PLL circuit.

A fifth feature of the present invention is that the adjustment control signal is shared with power supply to the receiving circuit.

A sixth feature of the present invention is that pre-adjustment is performed when the power of the portable telephone device is turned on.

FIG. 1 is a block diagram showing a first feature of the present invention in which characteristics are adjusted immediately before a reception timing when waiting for an intermittent operation, and FIG. 2 is a first feature of the present invention. FIG. 3 is a control timing chart at the time of waiting for an intermittent operation which is the first feature of the present invention.

Next, regarding the first feature of the present invention, FIG.
This will be described in detail with reference to FIGS.

Referring to FIG. 1, reception filter section 101
Has a reference frequency signal input, an adjustment state holding power supply input, a power supply input, and an adjustment start signal input, and starts adjustment at the rise of the adjustment start signal. The control unit 102 has a reference frequency signal output, an adjustment state holding power supply output, a power supply output, and an adjustment start signal output. Each signal is transmitted to the control unit 10
2 is connected to the input of the reception filter unit 101.

In the standby timing for performing the intermittent operation in FIG. 2, T is the time required for adjusting the receiving filter, S is the time until the circuit is stabilized after power is supplied, and A is
Indicates the stabilization time of the reference frequency signal.
The adjustment state holding power supply is always “ON”.

The reference frequency signal is turned "ON" T + A time before the level measurement start timing.

Thereafter, after the elapse of the AS time, the power supply is turned on.
N ”, and after the elapse of the S time, the adjustment start signal is set to“ O ”.
N ".

After the elapse of the time T, the adjustment of the characteristics is completed, the level measurement is started, the reception antenna is selected by diversity, and the reception data is received. When the reception slot is completed, the power supply and the adjustment start signal are turned “OFF”. When the receiving process is completed, the reference frequency signal is set to “OFF”.

With such an operation, the intermittent reception cycle of 7
It is possible to adjust the reception filter every 20 ms.

Next, the second feature of the present invention will be described in detail with reference to FIGS.

FIG. 4 is a control timing chart for adjusting characteristics immediately before reception timing for each frame during a communication operation, which is a second characteristic of the present invention, and FIG. 5 is a second characteristic of the present invention. 9 is a control flowchart in the case of adjusting characteristics immediately before a reception timing for each frame during a communication operation.

At the timing of the communication operation shown in FIG.
The reference frequency signal, the adjustment state holding power supply, and the power supply are always “ON”. The adjustment start signal is turned “ON” T time before the level measurement start timing.

After the reception process is completed, the adjustment start signal is set to “OF”.
F ".

With such an operation, during the communication operation, the reception filter can be adjusted at a cycle of 20 ms at the full rate, and at a cycle of 40 ms at the half rate.

Next, regarding the third feature of the present invention,
This will be described in detail with reference to FIGS.

FIG. 6 is a control timing chart in the case where the characteristics are adjusted immediately after an idle slot in the continuous receiving operation which is the third feature of the present invention, and FIG. 7 is the continuous receiving operation which is the third feature of the present invention. 6 is a control flowchart in the case where the characteristics are adjusted immediately after the idle slot at the time.

Referring to FIGS. 6 and 7, in the continuous reception operation, there is an Idel (idle) slot once every 15 seconds in order to perform at least the peripheral level measurement.

The reference frequency signal, the adjustment state holding power supply, and the power supply are always "ON". The adjustment start signal is set to “OFF” at the peripheral level measurement completion timing.

The adjustment start signal is turned "ON" T times before the start timing of the next reception slot.

With such an operation, even during continuous reception,
The adjustment of the reception filter can be performed in a period of at least 15 s.

Next, the fourth and fifth features of the present invention will be described in detail with reference to FIGS. 9, 8 and 10.

In a conventional portable telephone device, as shown in FIG. 9, a control unit 102 includes a receiving unit power supply for controlling a power supply of a receiving unit 103 and a PLL unit power supply for controlling a power supply of a PLL unit 104. The reference frequency signal has an output as a reference frequency of the PLL unit 104.

As shown in FIG. 8, the reference frequency signal is
By sharing the L unit 104 and the reception filter unit 101,
The control unit 102 has one without two reference signal sources.
It can be provided by two reference signal sources.

As shown in FIG. 10, in the conventional portable telephone device, the power supply of the PLL unit operates at the same timing as the power supply of the reception filter, and the power supply of the reception unit operates at the same timing as the adjustment start signal. I do. Therefore, as shown in FIG. 8, by sharing both, the circuit of the control unit 102 and the output signals can be reduced.

Next, regarding the sixth feature of the present invention, FIG.
1 and FIG.

FIG. 11 is a control timing chart in the case where the characteristics are adjusted in advance when the power of the portable telephone device is turned on, which is the sixth characteristic of the present invention, and FIG. 12 is the sixth characteristic of the present invention. 9 is a control flowchart in a case where characteristics are adjusted in advance when the power of the mobile phone device is turned on.

Referring to FIGS. 11 and 12, since the receiving filters are largely shifted in the initial state, it is necessary to repeat the adjustment several times.

When the power of the portable telephone device is “ON”, the power of the portable telephone device is turned “ON”, the adjustment state holding power supply is turned “ON”, and the reference frequency signal is turned “ON”.

The power is turned on after a lapse of time A until the reference frequency is stabilized, the adjustment start signal is turned on after a lapse of time S until the reference frequency is stabilized, and the adjustment is started after the lapse of the adjustment time T. Turn the signal "OFF" and "ON" again
And

"ON / OFF" of the adjustment start signal is performed N times (N is a positive integer) the number of times the initial adjustment is completed.

By doing so, the receiving filter can be used stably immediately after the power of the portable telephone device is turned on.

[0055]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

[0057]

Referring to FIG. 1, reference numeral 101 denotes a reception filter unit of a portable telephone device according to the present invention. The reception filter unit 101 includes a reference frequency signal input, an adjustment state holding power supply input, and a power supply input. The control unit 102 has a reference frequency signal output, an adjustment state holding power supply output, a power supply output, and an adjustment start signal output.

A reference frequency signal input of the reception filter unit 101 is connected to an output of a reference frequency signal of the control unit 102, and an adjustment state holding power supply input of the reception filter unit 101 is
The output of the adjustment state holding power source of the control unit 102 is connected, the power input of the reception filter unit 101 is connected to the output of the power source of the control unit 102, and the adjustment start signal input of the reception filter unit 101 is adjusted by the control unit 102 Each is connected to the output of the start signal.

[0059]

Next, the operation of one embodiment according to the present invention will be described.

In FIG. 1, the characteristics of the filter are adjusted with reference to a reference frequency signal.
It is connected to the adjustment circuit and can hold the adjustment state while the power is supplied.It performs the filter operation by the power supply, starts the adjustment operation at the rising edge of the adjustment start signal, and supplies the power. Thus, after the time S (1 ms) elapses, the circuit becomes stable, and after the filter adjustment operation is started, the adjustment is completed after the time T (1 ms) elapses, and the adjustment is stabilized from the initial state to the optimum state. In the mobile phone device having the reception filter unit 101 in which the number of repetition adjustments up to is N (20 times), the control unit 102 performs the following control in each operation mode.

As shown in FIG. 2, the portable telephone device operates in accordance with the control flow of FIG. 3 during standby for intermittent operation. This embodiment corresponds to feature 1 of the present invention described above.

Referring to FIG. 2 and FIG.
, The adjustment state holding power supply is turned “ON”.

In step 202, it is determined whether or not the time A + T (5 + 1 = 6 ms) of the level measurement start timing has been reached.

If the result of the determination in step 202 is NO, the process returns to the determination in step 202. If the result is YES, in step 203, the reference frequency signal is turned "ON".

Next, at step 204, the time AS
It is determined whether (5-1 = 4 ms) has elapsed.

If the result of determination in step 204 is YES, in step 205, the power is turned “ON”,
If no, the process returns to step 204 again.

Next, at step 206, the time S (1
ms) has elapsed.

If the result of determination in step 206 is YES, in step 207, the adjustment start signal is set to "O".
N ", and if NO, the process returns to step 207 again.

Next, in step 208, it is determined whether or not the reception slot has been completed.

If the result of determination in step 208 is YES, in step 209, the power is turned off, and
If NO, the process returns to step 208.

Next, in step 210, the adjustment start signal is turned "OFF".

Next, in step 211, it is determined whether or not the reception processing has been completed. If the result of this determination is YES, in step 212, the reference frequency signal is set to "O".
FF ", and if NO, the process returns to step 211.

After the reference frequency signal is turned off in step 212, the process returns to step 202.

By such an operation, the intermittent reception cycle of 7
It is possible to adjust the reception filter every 20 ms.

As shown in FIG. 4, the portable telephone device has a TD
When performing the communication operation in the MA, it operates according to the control flow of FIG. This embodiment corresponds to feature 2 of the present invention described above.

Referring to FIG. 4 and FIG.
, The adjustment state holding power supply is turned “ON”.

Next, at step 203, the reference frequency signal is turned "ON".

Next, at step 205, the power supply is set to "O".
N ".

Next, in step 213, it is determined whether or not the time T (1 ms) before the level measurement start timing is reached. If YES, the adjustment start signal is turned "ON" in step 207, and if NO, Step 2
Return to 13.

Next, at step 211, it is determined whether or not the reception processing is completed.
In, the adjustment start signal is set to "OFF", and thereafter, the process returns to step 213. If NO, the process returns to step 211.

With such an operation, during the communication operation, the reception filter can be adjusted at a period of 20 ms at the full rate, and at a period of 40 ms at the half rate.

As shown in FIG. 6, when the portable telephone device performs the continuous receiving operation, it operates according to the control flow of FIG. This embodiment corresponds to feature 3 of the present invention.

Referring to FIG. 6 and FIG.
, The adjustment state holding power supply is turned “ON”.

Next, at step 203, the reference frequency signal is turned "ON".

Next, in step 205, the power supply is set to “O”
N ".

Next, in step 213, it is determined whether or not the peripheral level measurement has been completed.
In the case of ES, in step 210, the adjustment start signal is set to "OFF", and in the case of NO, the process returns to step 213.

Next, at step 214, it is determined whether or not the time T (1 ms) before the reception slot start timing is reached.

If the result of determination in step 214 is YES, in step 207, the adjustment start signal is set to "O".
The process returns to step 213 as N ", and returns to step 214 if NO.

In the continuous reception operation, an Idel (idle) slot exists at least once every 15 seconds in order to perform at least the peripheral level measurement.

With such an operation, the reception filter can be adjusted at least for a period of 15 seconds even during continuous reception.

As shown in FIG. 8, the PLL of the control unit 102
The reference frequency signal connected to section 104 is connected to the reference frequency signal input of reception filter section 101.

The power of the PLL unit connected to the PLL unit 104 of the control unit 102 is connected to the power input of the reception filter unit 101.

The power supply of the receiving unit connected to the receiving unit 103 of the control unit 102 is connected to the adjustment start signal input of the receiving filter unit 101.

By sharing the reference frequency signal between the PLL section and the reception filter section, the control section can be supplied by one power supply signal source without having two reference signal sources.

Further, by sharing the PLL section power supply and the reception filter power supply, it is possible to reduce the number of circuits and output signals of the control section.

By sharing the adjustment start signal with the power supply of the receiving unit, the circuit of the control unit and the output signal can be reduced.

As shown in FIG. 11, when the power of the portable telephone device is turned “ON”, the operation is performed according to the control flow of FIG. This embodiment corresponds to the sixth feature of the present invention described above.

Referring to FIGS. 11 and 12, first, in step 217, the power supply of the portable telephone device is turned "ON".

Next, in step 201, the adjustment state holding power supply is turned "ON".

Next, at step 203, the reference frequency power supply is turned "ON".

Next, at step 215, it is determined whether time A (reference frequency signal stabilization time = 5 ms) has elapsed.

If the result of determination in step 215 is YES, in step 205, the power is turned “ON”,
If no, the process returns to step 215 again.

Next, at step 206, it is determined whether or not the time S (power supply stabilization time = 1 ms) has elapsed.

As a result of the determination in step 206, YES
In the case of, the adjustment start signal is turned "ON" in step 207, and in the case of NO, the process returns to step 206 again.

Next, at step 216, it is determined whether or not the time T (adjustment time = 1 ms) has elapsed.

If the result of determination in step 216 is YES, in step 210, the adjustment start signal is set to “OF”.
F ", and if NO, the process returns to step 216 again.

Next, at step 217, the number of repetitions N is determined. If NO, that is, if it is within the number of repetitions N (20 times), the process returns to step 207, and YES, that is, the end of the number of repetitions N, ends.

Thus, the receiving filter can be used stably immediately after the power of the portable telephone device is turned “ON”.

[0109]

The present invention is constructed and operates as described above, and according to the present invention, the following effects can be obtained.

It is known that the characteristics of a receiving filter using an active element are deteriorated due to a temperature change or an aging change. However, such a filter is always used in a mobile telephone device in an optimum state. it can.

The reason is that the filter is controlled so as to be constantly adjusted at regular time intervals.

Further, the control is performed so that the adjustment is repeated from the initial state to the optimum state when the power of the portable telephone device is turned on.

Further, according to the present invention, the power consumption of the filter can be reduced.

The reason is that when unnecessary, the power supply is switched to “O
FF ".

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment according to the present invention.

FIG. 2 is a control timing chart at the time of waiting for an intermittent operation, which is the first feature of the present invention.

FIG. 3 is a control timing chart at the time of waiting for an intermittent operation which is the first feature of the present invention.

FIG. 4 is a control timing chart in a case where the characteristics are adjusted immediately before a reception timing for each frame during a communication operation, which is a second characteristic of the present invention.

FIG. 5 is a control flowchart for adjusting characteristics immediately before reception timing for each frame during a communication operation, which is the second feature of the present invention.

FIG. 6 is a control timing chart in a case where characteristics are adjusted immediately after an idle slot during a continuous reception operation, which is a third feature of the present invention.

FIG. 7 is a control flowchart in a case where characteristics are adjusted immediately after an idle slot during a continuous reception operation, which is a third feature of the present invention.

FIG. 8 is a block diagram showing fourth and fifth features of the present invention.

FIG. 9 is a block diagram showing fourth and fifth features of the present invention.

FIG. 10 is a timing chart showing an example of control timing in a conventional circuit.

FIG. 11 is a control timing chart in a case where characteristics are adjusted in advance when the power of the mobile phone device is turned on, which is the sixth feature of the present invention.

FIG. 12 is a control flowchart in the case where characteristics are adjusted in advance when the power of the mobile phone device is turned on, which is the sixth feature of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 ... Reception filter part 102 ... Control part 103 ... Reception part 104 ... PLL part 105 ... Reception passive filter

Claims (8)

[Claims] An adjusting state holding power supply for adjusting a characteristic of a filter with reference to the reference frequency signal; , Connected to the adjustment circuit, can hold the adjustment state while the power is supplied, performs a filter operation by the supply of the power,
The adjustment operation is started at the rising edge of the adjustment start signal, and the power is supplied.After a lapse of time until the circuit is stabilized after the power is supplied, the circuit is stabilized, and the adjustment operation of the filter is started. After the time required for the adjustment of the reception filter elapses, the adjustment is completed, and the number of repetition adjustments from the initial state until the adjustment stabilizes to the optimum state is N (N is a positive integer). The control unit has a reference frequency signal output, an adjustment state holding power supply output, a power supply output, and an adjustment start output, and the reference frequency signal input of the reception filter unit is the reference frequency of the control unit. Connected to the output of the frequency signal,
The adjustment state holding power supply input of the reception filter unit is connected to an output of the adjustment state holding power supply of the control unit, the power supply input of the reception filter unit is connected to an output of the power supply of the control unit, and the reception filter The control circuit for a reception filter in a mobile phone device, wherein the adjustment start signal input of the unit is connected to the output of the adjustment start signal of the control unit. 2. The portable telephone device according to claim 1, further comprising a control circuit for the reception filter according to claim 1, wherein the power supply is shared with a power supply to a PLL circuit. Control circuit for receiving filter. 3. The reception filter control circuit according to claim 1, further comprising: sharing said reference frequency signal with a reference frequency signal to a PLL circuit.
3. A control circuit for a reception filter in the mobile phone device according to claim 1. 4. The portable telephone device according to claim 1, further comprising a control circuit for the reception filter according to claim 1, wherein the adjustment control signal is shared with power supply to a reception circuit. Control circuit for receiving filter. 5. A control circuit for a reception filter according to claim 1, wherein a power supply for performing an adjustment immediately before a reception timing for each intermittent return operation during standby for performing an intermittent operation, and a power supply for maintaining the adjusted state is provided. Always supply, then input the reference frequency signal, then supply the power, then input the adjustment start signal, after the end of reception, the reference frequency signal and the power supply and the adjustment start signal And "O
A method of controlling a reception filter in a mobile phone device, wherein the method is FF ". 6. A control of a reception filter in a portable telephone device, comprising the control circuit of the reception filter according to claim 1, wherein the adjustment is performed immediately before the reception timing for each frame when performing a communication operation. Method. 7. A method for controlling a reception filter in a mobile telephone device, comprising the control circuit for a reception filter according to claim 1, wherein the adjustment is performed immediately after an idle slot during continuous reception. 8. A method for controlling a reception filter in a mobile phone device, comprising the control circuit for the reception filter according to claim 1, wherein the adjustment is performed in advance when the power of the mobile phone device is turned on.