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Semiconductor integrated circuit and receiving apparatus

A technology of integrated circuits and semiconductors, applied in electrical components, multi-terminal pair networks, transmission systems, etc., can solve problems such as difficult low-voltage operation, increased installation costs, and degradation of analog circuit noise characteristics

Inactive Publication Date: 2012-09-26
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In an SoC (System on Chip: System on Chip) where analog and digital are mixed, signals generated by digital circuits and their harmonics affect analog circuits through power supply wiring, etc., and there is a problem that the noise characteristics of analog circuits deteriorate
For example, in a receiver, the noise characteristics of an LNA (Low Noise Amplifier: Low Noise Amplifier), one of the analog circuits, may deteriorate
In order to reduce the influence of noise, it is considered to set the LNA as a differential input, but due to the increase of input pins, the installation cost increases
In the differential configuration, a large voltage margin is required to generate a tail current source, so it is difficult to operate with a low voltage

Method used

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  • Semiconductor integrated circuit and receiving apparatus
  • Semiconductor integrated circuit and receiving apparatus
  • Semiconductor integrated circuit and receiving apparatus

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0031] figure 1 It is a schematic block diagram of the receiving device 100 of the first embodiment. The receiving device 100 includes an LNA (semiconductor integrated circuit) 2 , an LO (Local Oscillator: local oscillator) signal generating unit 3 , a demodulation circuit 4 , and an output signal processing circuit 5 . The receiving device 100 is mounted on, for example, a wireless LAN (Local Area Network: Local Area Network) device, processes a radio wave signal received by the antenna 1 , and outputs it to the outside.

[0032] LNA2 amplifies the radio signal received by antenna 1 . The LO signal generator 3 generates an LO signal to be used as a reference for demodulating the radio wave signal. The frequency of the LO signal is, for example, 2.5 GHz. The demodulation circuit 4 demodulates the amplified radio wave signal based on the LO signal. More specifically, the demodulation circuit 4 has a mixer 4a, a VGA (Variable Gain Amplifier: variable gain amplifier) ​​4b, an...

no. 2 Embodiment

[0082] The first embodiment described above is provided with an impedance adjustment section whose impedance value is fixed. On the other hand, in the second embodiment described below, an impedance adjustment unit whose impedance is variable is provided.

[0083] Figure 11 It is a schematic block diagram of an example of the internal configuration of the LNA 21 of the second embodiment. Figure 11 in, with figure 2 The same components are assigned the same symbols, and the following description will focus on the differences.

[0084] Control signals V1 to V3 are input to impedance adjustment units 111c, 121b, and 131b of LNA21, respectively. The impedances of the impedance adjustment parts 111c, 121b, and 131b can be variably controlled by the control signals V1 to V3. and figure 2 Similarly, at least one of the transconductance circuit 111 and the load circuits 121 and 131 only needs to have an impedance adjustment unit to which a control signal is input.

[0085] E...

no. 3 Embodiment

[0099] The third embodiment automatically sets the control signal in the second embodiment.

[0100] Figure 19 It is a schematic block diagram of the receiving device 101 of the third embodiment. Figure 19 in, with figure 1 The same components are attached with the same symbols, and the following description will focus on the differences.

[0101] Figure 19 The receiving device 101 further includes a detection circuit 6 and a control circuit 7 . Alternatively, LNA21 as Figure 11 As shown, there is at least one impedance adjustment part that variably controls the impedance according to the control signal. The detection circuit 6 detects degradation of the output signal of the output signal processing circuit 5 . The control circuit 7 sets the control signal of the LNA 21 so as to suppress the degradation of the output signal.

[0102] The control circuit 7 sets all the control signals to all values, for example, and finally sets the value in which the degradation of ...

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Abstract

According to one embodiment, a semiconductor integrated circuit has a transconductance circuit, a first load circuit, and a second load circuit. At least one of the above transconductance circuit, the first load circuit and the second load circuit has an impedance adjusting module to adjust impedance in the following way of deceasing a parameter P: P=Z01*Z04-Z02*Z03, wherein Z01 stands for impedance of the transconductance circuit from the view of a first output terminal, Z02 stands for impedance of the transconductance circuit from the view of a second output terminal, Z03 stands for impedance of the first load circuit, and Z04 stands for impedance of the second load circuit.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims Japanese Patent Application No. 2011-64572 filed March 23, 2011, the entire contents of which are hereby incorporated by reference. technical field [0003] Embodiments relate to semiconductor integrated circuits and receiving devices. Background technique [0004] In an SoC (System on Chip: System on Chip) where analog and digital are mixed, signals generated by digital circuits and their harmonics affect analog circuits through power supply wiring, etc., and there is a problem that the noise characteristics of analog circuits deteriorate. For example, in a receiving device, the noise characteristic of an LNA (Low Noise Amplifier: Low Noise Amplifier), which is one of analog circuits, may deteriorate. In order to reduce the impact of noise, it is considered to set the LNA as a differential input, but due to the increase of input pins, the installation cost increases. In the di...

Claims

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Application Information

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IPC IPC(8): H03H11/28H04B1/16
CPCH04B1/16
Inventor 织田翔子出口淳
Owner KK TOSHIBA
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