WO2002001860A1

WO2002001860A1 - Integrated circuit for wireless terminal and television receiver with integrated circuit

Info

Publication number: WO2002001860A1
Application number: PCT/JP2001/005488
Authority: WO
Inventors: Takeshi Ikeda; Hiroshi Miyagi
Original assignee: Niigata Seimitsu Co., Ltd.
Priority date: 2000-06-27
Filing date: 2001-06-27
Publication date: 2002-01-03
Also published as: TW519829B; JP2002010155A

Abstract

A tuner section (2, 3) and at least an electronic volume control (4) are formed in the form of a CMOS structure and integrated in one semiconductor chip (10). Since more of audio-related components can be integrated into one chip, the number of discrete components decreases, thus realizing a smaller and thinner television receiver. The tuner section (2, 3) and the electronic volume control (4) are integrated in the semiconductor chip (10), so that there is no need to design and manufacture the tuner section (2, 3) and the electronic volume control (4) separately.

Description

Description Integrated circuit for wireless terminal and television receiver using the same

The present invention relates to an integrated circuit for a wireless terminal and a television receiver using the same. For example, a predetermined configuration necessary for receiving and processing a television broadcast is provided on the same semiconductor substrate (chip). It is suitable for use in circuits that are integrated in a device. Background art

FIG. 1 is a diagram illustrating a general configuration of a television receiver that receives analog television broadcasting. In FIG. 1, an electric wave for television broadcasting received by an antenna 41 is input to a tuner 42. The tuner 42 generates and outputs an intermediate frequency (IF) signal by mixing the high frequency television signal input from the antenna 41 with a signal of a local oscillation frequency controlled according to a desired reception frequency.

The IF signal extracted by the tuner 42 is amplified by an intermediate frequency amplifier (IF amplifier) 43, and then video-detected by a video detection circuit 44 and audio-detected by an audio detection circuit 45. The signal output from the video detection circuit 44 is separated into a luminance signal and a chrominance signal by a video processing circuit 46, and further subjected to predetermined video signal processing to become a video signal. And the like. The signal output from the audio detection circuit 45 is subjected to processing such as FM demodulation by an audio processing circuit 47 to be an audio signal, and is appropriately amplified and output to a speaker or the like (not shown). FIG. 2 is a diagram showing a configuration of the tuner 42. In FIG. 2, a high-frequency television signal for television broadcast received by an antenna 41 is passed through a band-pass filter (BPF) 51, a high-frequency amplifier (RF amplifier) 52, and a band-pass filter (BPF) 53. Input to one input terminal of mixer 54. A local oscillation signal having a local oscillation frequency output from a frequency conversion oscillator (VCO) 55 is input to the other input terminal of the mixer 54. The local oscillation frequency of the signal output from the VCO 55 is controlled by a PLL (Phase Locked Loop) circuit 56 according to the set desired reception frequency. The mixer 54 generates an intermediate frequency (IF) signal by mixing the high-frequency television signal output from the BPF 53 and the local oscillation signal output from the VC 555, and Output to amplifier 4 3. The tuner 42 may include an IF amplifier 43.

By the way, in recent years, television receivers have begun to launch digital broadcasting, such as digital satellite broadcasting using BS (broadcast satellite) and CS (communication satellite), terrestrial digital broadcasting, and cable television broadcasting. Therefore, the development as a digital TV is proceeding at a rapid pace. In such a situation, the integration of tuners has been promoted, and passive elements such as band-pass filters, RF amplifiers, and mixer circuits, which have been realized as external components of semiconductor integrated circuits, have been replaced by digital circuits such as PLL circuits. At the same time, an LSI packaged on a single semiconductor substrate (chip) has been developed.

However, as described above, although the integration of tuners has been advanced to some extent, the integration of other functional components necessary for constructing a television receiver has been insufficient. For example, a volume circuit for adjusting the volume of output sound is still realized by an analog circuit using a bipolar transistor or the like, and the volume was adjusted in an analog manner. That is, the above-described volume circuit is realized using, for example, an FM detection circuit. The FM detection circuit is a phase shift circuit that shifts the phase of the IF signal by 90 degrees at the center frequency, and a multiplication circuit that performs phase detection using the IF signal and the output signal of the phase shift circuit and outputs an FM detection signal It is comprised including. Then, the IF signal was passed through the FM detection circuit thus configured, and the volume was adjusted by changing the magnitude of the output DC voltage.

Conventionally, the above-described phase shift circuit has been constituted by passive elements such as capacitors and coils, and has been realized as an external component of a semiconductor integrated circuit. As a result, the number of components has increased, which has been one of the factors that hinder the thinning and miniaturization of television receivers. Also, since the number of components is large and the semiconductor substrate on which the tuner and the like are mounted and the printed circuit board on which the external components such as the volume circuit are mounted must be designed and manufactured separately, the design time and There was also a problem that the manufacturing cost was high.

In addition, since a semiconductor chip on which a tuner or the like is mounted and an external component on which a volume circuit or the like is mounted are manufactured separately, there is a variation in the manufacturing of elements between the semiconductor chip and the external component, and the television set to be manufactured is manufactured. There was also a problem that the performance of the receiver was not stable.

The present invention has been made to solve such a problem, and aims at further integrating circuits necessary for configuring a wireless communication terminal such as a television receiver, and further improving the apparatus. The aim is to be able to reduce the size and thickness of products, reduce manufacturing costs, and shorten design time. Disclosure of the invention

An integrated circuit for a wireless terminal according to the present invention is an integrated circuit for a wireless terminal in which at least a part of a circuit used for wireless communication is integrated on a semiconductor substrate. The tuner section that receives the wave signal and performs predetermined processing to output an intermediate frequency signal corresponding to the desired reception frequency is the same as the volume section that adjusts the level of the signal processed by the tuner section. Integrated on a semiconductor substrate.

According to another aspect of the present invention, the tuner section and the polysilicon section are both integrated on the same semiconductor substrate by a CMOS circuit.

In another aspect of the present invention, the volume section is an electronic volume including a ladder resistor including a plurality of resistors and a switch group including a plurality of switches.

Another aspect of the present invention is characterized in that an amplifier for amplifying a signal whose level has been adjusted by the volume section is further integrated on the same semiconductor substrate as the tuner section and the polymer section.

Alternatively, an amplifier for amplifying the signal whose level has been adjusted by the volume section is mounted outside a semiconductor substrate on which the tuner section and the polymer section are integrated.

According to another aspect of the present invention, there is provided an integrated circuit for a wireless terminal in which at least a part of a circuit used in wireless communication is integrated on a semiconductor substrate, wherein a high-frequency signal is received and a predetermined process is performed. An audio circuit including a tuner section that outputs an intermediate frequency signal corresponding to the desired reception frequency and a volume section that adjusts the volume of the signal processed by the tuner section is integrated on the same semiconductor substrate. It is characterized by having

Further, the television receiver of the present invention is a television receiver in which at least a part of a circuit used for receiving a television broadcast is integrated on a semiconductor substrate, and receives a high-frequency signal. A tuner section that outputs an intermediate frequency signal corresponding to a desired reception frequency by performing predetermined processing in An integrated circuit in which a volume section for adjusting the level of a signal processed by the tuner section is integrated on the same semiconductor substrate; and a tuner section and a poly-lume section in the integrated circuit. It is characterized by comprising a control unit for controlling the entire television receiver, and a bus for connecting the integrated circuit and the control unit.

In another aspect of the present invention, the tuner section and the volume section in the integrated circuit are both integrated on the same semiconductor substrate by a CMOS circuit.

According to another aspect of the present invention, the volume section is an electronic volume including a ladder resistor including a plurality of resistors and a switch group including a plurality of switches.

In another aspect of the present invention, the integrated circuit further includes an integrated amplifier for amplifying a signal whose level has been adjusted by the volume unit.

Alternatively, an amplifier for amplifying the signal whose level has been adjusted by the volume unit is mounted outside the integrated circuit.

Since the present invention comprises the above technical means, it is possible to integrate not only the tuner section but also at least the tuner section and the volume section into a CMOS structure and to integrate them on one semiconductor substrate. Can be combined into one chip. In addition, not only the above-mentioned volume part but also the amplification part and the like can be integrated on the same semiconductor substrate in a CMS structure so that almost all of the audio circuits can be integrated into one chip.

As a result, the number of parts can be reduced and the size and thickness of the television receiver can be further reduced. Also, when designing and manufacturing audio circuits, it is necessary to design and manufacture the semiconductor chip and its external components separately. Instead, they can be performed on a single semiconductor chip, so that design time can be greatly reduced and manufacturing costs can be significantly reduced. In addition, since the manufacturing variation of the elements in one semiconductor chip is suppressed, the stability of the performance of the television receiver can be improved.

In addition, since the volume of the output sound can be digitally adjusted, the volume can be adjusted with a microcomputer in addition to tuning in the tuner section (selecting the desired reception frequency), and the volume can be stabilized. You can control it. Also, the volume can be easily adjusted by remote control using a remote controller.

Further, a common digital bus can be used in various functional circuit units in the integrated chip, so that the circuit configuration can be further simplified and the size of the device can be further reduced.

According to another feature of the present invention, damage to the semiconductor chip or deterioration in performance due to the heat generation is suppressed by using an amplifying section that generates more heat with power consumption as an external component of the semiconductor chip. be able to. In addition, the same semiconductor chip can be used in common regardless of the size of large or small television receivers, and only the amplification part of external components can be used separately for large and small televisions. Efficiency can be improved. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram illustrating a general configuration example of a television receiver. Fig. 2 is a diagram showing a configuration example of a tuner.

FIG. 3 is a diagram illustrating a configuration example of a main part of the television receiver according to the first embodiment. FIG. 4 is a diagram showing a configuration example of an electronic volume.

FIG. 5 is a diagram showing a configuration example of a main part of a television receiver according to the second embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a diagram illustrating a configuration example of a main part of the television receiver according to the first embodiment. As shown in FIG. 3, the television receiver according to the first embodiment includes an antenna 1 for receiving a television wave, a tuner 2, an intermediate frequency amplifier (IF amplifier) 3, an electronic volume 4, and an audio processing circuit. 5, power amplifier 6, video processing circuit 7, flash memory 11, RAMI2, micro computer (microcomputer) 13, etc.

The radio wave for television broadcast received by antenna 1 is input to tuner 2. The tuner 2 is configured as shown in FIG. 2, and mixes a high-frequency television signal received via the antenna 1 with a signal of a local oscillation frequency controlled according to a set desired reception frequency. Thus, an intermediate frequency (IF) signal is extracted. The IF signal extracted by the tuner 2 is amplified by the IF amplifier 3. The tuner 2 and the IF amplifier 3 constitute the tuner of the present invention.

The IF signal output from the IF amplifier 3 is subjected to predetermined video signal processing by a video processing circuit 7 for video, and is output as a video signal to a display device (not shown) such as a CRT or LCD. On the other hand, the audio is digitally adjusted in volume by the electronic volume 4 and then subjected to predetermined audio signal processing by the audio processing circuit 5. Then, the signal is appropriately amplified by the power amplifier 6 and output to a speaker or the like (not shown). In the present embodiment, a television receiver configured as shown in FIG. The tuner 2, IF amplifier 3, electronic amplifier 4, audio processing circuit 5, and power amplifier 6, which perform at least audio-related processing, are all composed of CMOS circuits and have one semiconductor substrate (chip). ) It is mounted on 10. The semiconductor chip 10 and the video processing circuit 7 are connected to a digital bus 14.

The flash memory 11, the RAM I 2, and the microcomputer 13 receive digital broadcast waves such as digital satellite broadcasts such as BS and CS, terrestrial digital broadcasts, and cable television broadcasts by the semiconductor chip 10, and display devices. It is provided to perform a series of controls for the process of outputting video and audio to a device or speaker. That is, the flash memory 11, the RAM I 2, and the microcomputer 13 are also connected to the digital bus 14, and control the operations of the semiconductor chip 10 and the video processing circuit 7 described above.

FIG. 4 is a circuit diagram showing a configuration example of the electronic volume 4. As shown in FIG. 4, the electronic volume 4 is composed of a ladder resistor 21 composed of a plurality of resistors Rl, R2, and Rn and a switch composed of a plurality of switches SW1, SW2,. This is a digital circuit composed of group 2 2. The switches SW 1, SW 2,... SWn forming the switch group 22 are each constituted by, for example, a CMOS element having a so-called transmission gate structure.

The plurality of switches SW 1, SW 2, —SWN ONZOFF are controlled by the microcomputer 13 of FIG. 3 configured by a CPU or MPU or the like via the data bus 14. It is controlled according to the signal, and the sound volume is adjusted digitally depending on which switch is turned on. As described above, in the present embodiment, an electronic volume 4 having a CMOS structure is provided instead of an analog volume having a capacitor and a coil as in an FM detection circuit. Then, add to tuner 2 and IF amplifier 3. In addition, since the electronic volume 4, the audio processing circuit 5, and the power amplifier 6 are all integrated on a single semiconductor chip 10 as a CMOS structure, almost all of the audio circuits can be integrated into one chip. By reducing the number of parts, the size and thickness of the device can be further reduced.

In addition, when designing and manufacturing audio circuits, it is not necessary to separately design and manufacture a semiconductor chip and its external components, as in the past, and it is possible to collectively perform the processing on a single semiconductor chip 10. As a result, the design time can be significantly reduced, and the manufacturing cost can be significantly reduced. In addition, since the manufacturing variation of the elements within one semiconductor chip 10 can be suppressed, the performance variation of the television receiver can be suppressed. Furthermore, since the volume of the output sound can be digitally adjusted, not only can the microcomputer 13 select the tuner 2 (select the desired reception frequency) but also the microcomputer 13 can adjust the volume. It can be carried out. When adjusting the volume analogously as in the past, the output level may change due to external factors such as temperature. However, in the present embodiment, the volume of the output sound is digitalized by adopting a CMOS structure. The volume can be adjusted and the volume can be controlled stably.

In addition, since the volume can be adjusted by the microcomputer 13, the volume can be easily adjusted by remote operation using a remote controller (not shown).

Further, according to the present embodiment, a common digital bus 14 can be used for the tuner 2, IF amplifier 3, electronic volume 4, and audio processing circuit 5, which are integrated into one chip. Distribution), the circuit configuration can be further simplified, and the size of the device can be further reduced. Next, a second embodiment of the present invention will be described.

FIG. 5 is a diagram showing a configuration example of a main part of a television receiver according to the second embodiment. In FIG. 5, components denoted by the same reference numerals as those shown in FIG. 3 have the same functions.

As shown in FIG. 5, the television receiver according to the second embodiment also includes an antenna 1 for receiving a television wave, a tuner 2, an IF amplifier 3, an electronic polymer 4, an audio processing circuit 5, a power amplifier 6, video processing circuit 7, flash memory 11, RAMI 2, microcomputer 13 and so on.

However, in the second embodiment, the tuner 2, the IF amplifier 3, the electronic volume 4, and the audio processing circuit 5 among the audio circuits that perform audio processing are configured by CMOS circuits, and are mounted on one semiconductor chip 30. Implemented. In the present embodiment, at least the power amplifier 6 is realized as an external component to the semiconductor chip 30.

Also in the present embodiment, in addition to the tuner 2 and the IF amplifier 3, the electronic polymer 4 and the audio processing circuit 5 also have a CMOS structure, and are mounted on a single semiconductor chip 30, so that they are The number of parts can be reduced, and the device can be made smaller and thinner. In addition, effects similar to the effects described in the first embodiment can be achieved in the present embodiment.

Furthermore, in the present embodiment, only the power amplifier 6, which generates more heat with power consumption, is an external component of the semiconductor chip 30, so that damage to the semiconductor chip 30 or deterioration in performance due to heat is suppressed. be able to . In addition, it is necessary to use different power amplifiers 6 having different amplification capabilities for a large television receiver having a large display screen and a small television receiver having a small display screen. To 30 Regardless of the size of the TV, they can be used in common regardless of the size of the TV, and only the power amplifier 6 can be used for large TVs and small TVs, which is very efficient in design or manufacture.

In the example of FIG. 5, the tuner 2, the IF amplifier 3, the electronic volume 4, and the audio processing circuit 5 are mounted on one semiconductor chip 30, but the tuner 2, the IF amplifier 3, and the electronic volume 4 May be mounted on one semiconductor chip, and the remaining audio processing circuit 5 and power amplifier 6 may be provided as external components.

In the examples of FIGS. 3 and 5, a digital demodulation circuit between the IF amplifier 3 and the electronic program 4, for example, a PSK (Phase Shift Keying) demodulation circuit for performing a phase shift demodulation process, or a quadrature amplitude A QAM (Quadrature Amplitude Modulation) demodulation circuit for performing demodulation processing may be provided, and the PSK demodulation circuit or the QAM demodulation circuit may be mounted on the same semiconductor chip.

In addition, the present invention can be applied to a television receiver that receives digital broadcasts and a television receiver that receives analog broadcasts.

In each of the above embodiments, the case where the wireless terminal integrated circuit (semiconductor chip) of the present invention is applied to a television receiver has been described. However, the present invention is not limited to this. The present invention can be similarly applied to a device that receives at least a voice signal by wireless communication, performs predetermined processing, and outputs the processed signal. For example, the present invention can be applied to a wireless communication terminal such as a mobile phone or a PHS having an RF filter or the like, and a radio receiver for an AM broadcast, an FM broadcast, a short wave broadcast, or the like.

In each of the above embodiments, the example in which the semiconductor chip is configured by the CMOS circuit has been described. You may.

In addition, each of the above-described embodiments is merely an example of the embodiment of the present invention, and the technical scope of the present invention is limitedly interpreted. It must not be. That is, the present invention can be implemented in various forms without departing from its spirit or its main features. '' Industrial applicability

The present invention achieves further integration of the circuits necessary for configuring a television receiver, thereby realizing a further reduction in the size and thickness of the device, a reduction in manufacturing costs, and a reduction in design time. Useful for

Claims

The scope of the claims

1. An integrated circuit for wireless terminals in which at least a part of the circuit used for wireless communication is integrated on a semiconductor substrate.

A tuner section that receives a high-frequency signal and performs predetermined processing to output an intermediate frequency signal corresponding to a desired reception frequency is the same as a volume section that performs level adjustment on the signal processed by the tuner section. An integrated circuit for a wireless terminal, wherein the integrated circuit is integrated on a semiconductor substrate.

2. The integrated circuit for a wireless terminal according to claim 1, wherein both the tuner section and the film section are integrated on the same semiconductor substrate by a CMOS circuit.

3. The volume control device according to claim 2, wherein the volume portion is an electronic program including a ladder resistor including a plurality of resistors and a switch group including a plurality of switches. An integrated circuit for a wireless terminal according to claim 1.

4. The amplifier according to claim 1, wherein an amplifier for amplifying the signal whose level has been adjusted by said poly-unit is further integrated on the same semiconductor substrate as said tuner and said volume. 14. The integrated circuit for a wireless terminal according to item 9.

5. The claim 1, wherein an amplifying section for amplifying the signal whose level has been adjusted by the volume section is mounted outside a semiconductor substrate on which the tuner section and the volume section are integrated. 4. The integrated circuit for a wireless terminal according to claim 1.

6. An integrated circuit for wireless terminals in which at least a part of circuits used for wireless communication is integrated on a semiconductor substrate.

A tuner section that receives a high-frequency signal and performs predetermined processing to output an intermediate frequency signal corresponding to a desired reception frequency; An integrated circuit for wireless terminals, wherein an audio circuit including a volume section for adjusting the volume of a processed signal is integrated on the same semiconductor substrate.

7. A television receiver in which at least a part of a circuit used for receiving a television broadcast is integrated on a semiconductor substrate,

A tuner section that receives a high-frequency signal and performs predetermined processing to output an intermediate frequency signal corresponding to a desired reception frequency, and a volume section that performs level adjustment on the signal processed by the tuner section are the same half. An integrated circuit integrated on a semiconductor substrate;

A control unit for controlling the entire television receiver including a tuner unit and a film unit in the integrated circuit;

A television receiver comprising: a bus to which the integrated circuit and the control unit are connected.

8. The television receiver according to claim 7, wherein both the tuner section and the volume section in the integrated circuit are integrated on the same semiconductor substrate by a CMOS circuit. .

9. The television receiver according to claim 8, wherein the volume portion is an electronic volume composed of a ladder resistor including a plurality of resistors and a switch group including a plurality of switches. Machine.

10. The television receiver according to claim 7, wherein the integrated circuit further integrates an amplifying unit that amplifies a signal whose level has been adjusted by the volume unit. .

11. The television receiver according to claim 7, wherein an amplification section for amplifying the signal whose level has been adjusted by the volume section is mounted outside the integrated circuit.