JPS5866435A - Receiving circuit of transmitter and receiver - Google Patents

Abstract

PURPOSE:To save the electric power, by supplying the power only to a circuit having slow responsiveness of output in the entire range of a certain section and then supplying the power to the circuits excepting the above-mentioned ones in a short range of a certain section. CONSTITUTION:A power supply VA is applied to a demodulating circuit 6 containing a limiting amplifier 17 having the slow responsiveness of output through a transistor TR1 which is controlled by a long pulse. A power supply control circuit 21 delivers both a long pulse and a short pulse with a certain cycle. Then the VA is supplied to the circuit 6 in a period during which the TR1 is turned on in a section corresponding to a long pulse. At the same time, the TR1 is turned on for a certain period and in response to the short pulse in a short section at the latter part of a section which is prescribed by the long pulse. In this duration, a power supply VB is applied to the circuits other than the circuit 6.

Description

[Detailed description of the invention]

The present invention applies to transmitting and receiving circuits used in wireless interfaces. Conventionally, this type of transmitter/receiver circuit is i! Is it possible to have a circuit configuration as shown in Figure 81? That is, the transmitter and receiver of each station consists of a transmitter circuit section (1) and a receiver circuit section (2), and when the call switch (3) of the transmitter circuit section (if) is turned on, a call signal is transmitted on a carrier wave. The signal is antenna I
4) It is now more likely to be emitted towards the other station. In the standby transmitter/receiver, the receiver circuit unit (2) sends the transmitted signal to the demodulator circuit (+1) via the front end (+1).
6) demodulates the electromagnetic waves, a calling signal ejection circuit (7) discriminates the calling signal, drives a notification circuit (8), and makes a ringing tone emit from a speaker (9). During a call, the demodulated audio signal is amplified by a low frequency amplification circuit and the audio is reproduced. In the figure, (11) is a transmitting microphone connected to the transmitting circuit section 11), and O4 is a receiving antenna. By the way, in order to save power, the conventional transmitting and receiving circuits of receivers supply PW power for a certain period at a certain period t to the receiving circuit section (2) during reception standby as shown in FIG. 2(c). , only a certain period PW can be received, and as shown in Fig. 2(a), the call switch SW of the transmitting circuit section +11 of the other station is turned on, and the

[When a paging signal is transmitted for a certain period of time, the paging signal is detected as shown in FIG. 2(d) in the receiving section PW during the transmission period. In this case, the average circuit current flowing through the receiving circuit section (2),
It would be better to make the fixed period PW smaller, but the fixed period t is related to the reception response after the call switch (3) is turned on, and there is a limit to making it larger, even if it is for power saving. , t and the fixed interval PW are related to the output response IC of the receiving circuit section (2) and are determined from the block whose rise is slowest. Figure 3 shows a concrete circuit block diagram of the receiving circuit section (2), which includes a high frequency amplifier circuit α, local oscillation circuits (14+), (14t), and a frequency mixing circuit (15 , ), (15, bandpass filter (t
ea), (tag) front engine F i6), etched ink amplifier (1 unit, 90'H △φ phase shift circuit (111, multiplier 0 unit, PLL circuit from O-bus filter) When using the constructed demodulation circuit-6) and the low-frequency amplifier circuit 01 to receive a large amount of call signal as detected, the output response in a certain period PW is extremely poor in the circuit. The etch ink amplifier (
Even if the response is extremely low compared to the response of the L amplifier, the ability to reduce power consumption depends on the response of the etch ink amplifier (1 to 5), and there is a limit to the reduction in power consumption. This invention was developed in view of the above, and its purpose is to provide a receiving circuit for a transmitting and receiving device that uses electricity for slaughtering in a large-volume receiving system. Fig. 4 shows a circuit block diagram of the receiving circuit section (2), and the phantom in the figure is a power supply control circuit consisting of an oscillation circuit, etc., which outputs long pulses at the same frequency at a constant period. At the same time, a short pulse is output in synchronization with the latter period of the chief pulse, and these long and short pulses turn on the transistor Tft I Trt, and the power supply V of the receiving circuit section (2) is supplied through these transistors Trs and Try. For example, the front end (6) of the reception circuit (2), the low frequency amplifier circuit, the calling signal detection circuit (1), and the notification circuit (1) are supplied with short pulses. The power supply VB is supplied through the controlled transistor Tft, and the power supply Vm is supplied through the long pulse controlled transistor Tr1 to the demodulation circuit I6) equipped with an engineering amplifier Oη having a slow output response. The configuration of the receiving circuit section (2) is fJ3.
It has the same configuration as the circuit shown in the figure, and the front end (6), demodulation circuit +6), and low frequency amplification circuit (-) are constructed from ordinary well-known circuits, and the explanation of their operation will be omitted. However, if it is waiting for reception, the power supply control is 0.
- In the loop circuit (21), a long pulse and a short pulse are outputted at a constant period, and the section transistor Tr+ corresponding to the long pulse is turned on as shown in FIG. 6(C), and the power is supplied during this on period. Vmu is supplied to the demodulation circuit (6) by the transistor Ttt.
is turned on at regular intervals, and during this on period, the power supply Vs is supplied to circuits other than the demodulation circuit I6. Therefore, during the supply period of the power source Va, the receiving circuit section (2) is in a receiving ready state. Now, as shown in Figure 965 (a), the ringing switch (3) of the transmitting circuit section t1) of the other station is turned on, and as shown in Figure 965 (b), a ringing signal is output for a certain period of time by a one-shot multivibrator, etc. When the signal is transmitted, the receiving circuit section (2) on the receiving station side sends the signal to the front end ill and the demodulating circuit V.
A calling signal is emitted as shown in Figure 45 (-) via $1 and the calling signal detection circuit (7).
7) Drive the notification circuit ;・) by the Yosho detection output,
The notification output drives the speaker (9) to notify that there is a call. In many cases, the transmission time of the transmission signal is set to be longer than the large cycle, so that once the transmission signal is transmitted, it can always be detected by the receiving side. The present invention is configured as described above, and power is supplied only to the demodulation circuit using the 3mm amplifier having a slow output response during the entire period of a certain period that is operated at a certain period. Since it is equipped with a receiving circuit section that supplies power to circuits other than the demodulation circuit during a short period at the end of a certain section, unnecessary power supply to most of the receiving circuit sections with excellent responsiveness is eliminated. This makes it possible to achieve further power savings, and for example, even small-capacity batteries can be used for long periods of time.

[Brief explanation of drawings]

Figure 1 is a basic circuit 1057 diagram of the transmitter and receiver, Figure 2 (axis)/-(d) is a time chart for explaining the conventional receiving system, and Figure 3 is the circuit diagram of the conventional receiving circuit section. J diagram, 4th
The figure is a circuit diagram of the receiving circuit section according to an embodiment of the present invention, FIGS. (2) is the receiving circuit section, (6) is the floating end, (6) is the demodulating circuit, (1
(to) is a low frequency amplification circuit, (1 outrage!) Shitinji amplifier. Agent Patent attorney Ishi 1) Choshichi

Claims (1)

[Claims] (1) While waiting for reception, power is supplied to the reception circuit section consisting of the front end, demodulation circuit, calling signal detection section, low frequency amplification circuit, etc. for a certain period at a certain period, and the calling signal from the other party's station is ignored. In the transmitting and receiving circuit of the receiver, which uses a receiving system that detects the constant frequency, power is supplied only to the demodulation circuit using a limit amplifier with slow output response during the entire period of a certain period that is repeated at a certain period. A transmitter comprising a receiving circuit section to which power is supplied to circuits other than the demodulating circuit during a short section at the rear of the section,
Receiver receiving circuit.