发明名称 |
Transit mixer with current mode input |
摘要 |
A differential mixer (DM) used in a telecommunication radio transmitter able to operate with a 3 Volt supply includes a silicon bipolar cross-connected pair of differential amplifiers (A; B) for receiving a first input voltage (LO) at a high frequency, a pair of current sources (I1; I2), and a voltage-to-current MOS converter (VIC) for receiving a second input voltage (VIN) at a lower frequency. The converter is adapted to convert the low frequency voltage to a differential current (INN) and is coupled to the junction points of the amplifiers and the current sources. The converter further includes a regulated differential cascode circuit (P1; P2) to which the low frequency input voltage (VIN) is applied via resistors (RI1; RI2) and which is coupled to the supply terminals (VCC; GND) of the mixer via two pairs of constant current sources (PB1, PB2; NB1, NB2) respectively. Preferably, a constant reference voltage terminal (VCC/2) is applied to the gate electrode of the transistors (P1; P2) of the cascode circuit via an operational amplifier (O1; O2).
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申请公布号 |
US5642071(A) |
申请公布日期 |
1997.06.24 |
申请号 |
US19950554448 |
申请日期 |
1995.11.07 |
申请人 |
ALCATEL N.V. |
发明人 |
SEVENHANS, JOANNES MATHILDA JOSEPHUS;BACQ, JEAN-LUC DONAT MAURICE R.;MACQ, DAMIEN LUC FRANCOIS |
分类号 |
H03D7/14;(IPC1-7):H03B19/00 |
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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