发明名称 |
Semiconductor integrated circuit |
摘要 |
An output signal gain is improved by a semiconductor integrated circuit comprising a mixer circuit having an upper-stage transistor circuit to which a local signal is inputted and a lower-stage transistor circuit to which an RF signal is inputted, wherein a first resistance and a second resistance serving as a load are connected between the upper-stage transistor circuit and supply voltage, and a result of multiplication operation performed via the upper-stage transistor circuit and the lower-stage transistor circuit is made to appear as a first signal and a second signal at the first resistance and the second resistance respectively on the basis of the supply voltage; an emitter follower circuit including a first transistor and a second transistor for respectively receiving outputs from the first resistance and the second resistance and outputting a first amplified signal and a second amplified signal that have been subjected to impedance conversion on the basis of the supply voltage; and an operational amplifier circuit for receiving the first amplified signal on an inverting input side via an input resistance and the second amplified signal on a non-inverting input side, the operational amplifier circuit including a feedback resistance for connecting its output side and the inverting input side provided with the input resistance.
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申请公布号 |
US6388502(B2) |
申请公布日期 |
2002.05.14 |
申请号 |
US20010756215 |
申请日期 |
2001.01.09 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
KANEKI KAZUO;MIKI TAKAHIRO |
分类号 |
H03D7/14;H03F1/34;H03F3/45;(IPC1-7):G06F7/44 |
主分类号 |
H03D7/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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