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    • 9. 发明授权
    • CONVERTER WITH PARALLEL COUPLED DIFFERENTIAL INPUT PAIRS
    • 与并行差分输入对转换器
    • EP2005582B1
    • 2011-09-14
    • EP07735210.2
    • 2007-03-21
    • NXP B.V.
    • WANG, Zhenhua
    • H03F3/45
    • H03F3/45183H03F3/45475H03F2203/45138H03F2203/45361H03F2203/45574
    • A circuit (1) for converting first and second differential input signals into an output signal is provided with a first differential input stage (10) comprising first and second inputs (11,12) for receiving the first differential input signal and comprising first and second outputs (13,14) and with a second differential input stage (20) comprising third and fourth inputs (21,22) for receiving the second differential input signal and comprising third and fourth outputs (23,24) and with an output stage (30) comprising a first terminal (31) connected to the first output (11) that is further connected to the third output (21) and comprising a second terminal (32) connected to the second output (12) that is further connected to the fourth output (22) and comprising a third terminal (33) for providing the output signal, to avoid complex operational amplifiers. The differential input stages (10,20) comprise two pairs of transistors (15,16,25,26) and the output stage (30) comprises a current mirror with a third pair of transistors (34,35). A regulator (4) comprises the circuit (1) and a modulator stage (40) for in response to the output signal modulating a voltage supply signal.
    • 10. 发明公开
    • Amplifier circuit
    • Verstärkungsschaltung
    • EP1083655A2
    • 2001-03-14
    • EP00119379.6
    • 2000-09-11
    • KABUSHIKI KAISHA TOSHIBA
    • Ishii, HirotomoCzarnul, Zdzislaw
    • H03F3/45
    • H03F3/45183H03F3/45475H03F3/45659H03F3/45766H03F3/45991H03F2203/45418H03F2203/45424H03F2203/45574
    • A balanced type DDA 1 is combined with a single end type DDA 2 to form a differential amplifier circuit 3 which is a balanced type DDA- The balanced type DDA 1 has four input terminals VPP, VPN, VNN and VNP which are input terminals of two differential input stages, and two output terminals VoutP and VoutN which are output terminals of two output stages. These terminals are four input terminals and two output terminals of the differential amplifier circuit 3. The single end type DDA 2 has four input terminals, which are input terminals of two differential input stages and which are connected to the four input terminals of the differential amplifier circuit 3, respectively. The single end type DDA 2 also has an output terminal vout of one output stage, which serves as a control output terminal for the feedback control of the differential amplifier circuit 3. By the negative feedback of the signal of the control output terminal Vout, a virtual short-circuit can be established between two input terminals of each differential input stages, so that it is possible to reduce distortion without reducing gains.
    • 平衡型DDA 1与单端DDA2组合形成平衡型DDA的差分放大电路3。平衡型DDA 1具有四个输入端子VPP,VPN,VNN和VNP,输入端为二 差分输入级,以及作为两个输出级的输出端子的两个输出端子VoutP和VoutN。 这些端子是差分放大器电路3的四个输入端子和两个输出端子。单端型DDA2具有四个输入端子,它们是两个差分输入级的输入端子,它们连接到差分放大器的四个输入端子 电路3。 单端型DDA2还具有一个输出级的输出端子vout,其作为用于差分放大器电路3的反馈控制的控制输出端子。通过控制输出端子Vout的信号的负反馈,a 可以在每个差分输入级的两个输入端之间建立虚拟短路,使得可以在不减少增益的情况下减少失真。