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公开(公告)号：US20150326198A1
公开(公告)日：2015-11-12
申请号：US14670031
申请日：2015-03-26
Applicant: Linear Technology Corporation
Inventor： Petrus M. Stroet
CPC classification number: H03G3/3042 , H03F1/0205 , H03F1/32 , H03F3/19 , H03F3/45098 , H03F2200/336 , H03F2200/451 , H03G1/0023 , H03G1/0029 , H04L27/34 , H04L27/368
Abstract: In a variable gain amplifier, a base of a bipolar first transistor receives a first differential input signal. The emitter of the first transistor is connected in series between a first resistor and a MOSFET coupled to ground. An output of the amplifier is a current through the collector. The conductivity of the MOSFET controls a gain of the amplifier. A bipolar second transistor receives a second differential input signal, and the second transistor provides a modulated gate voltage to the MOSFET. The drain voltage of the MOSFET is modulated by the first differential input signal and thus undesirably generates distortion. To reduce the distortion, the modulated gate voltage causes the AC component for a certain DC voltage at the drain of the MOSFET to be lowered, improving linearity. Since no current source is used, the amplifier has a large headroom, allowing operation using a low operating voltage.
Abstract translation: 在可变增益放大器中，双极性第一晶体管的基极接收第一差分输入信号。 第一晶体管的发射极串联在第一电阻和耦合到地的MOSFET之间。 放大器的输出是通过集电极的电流。 MOSFET的电导率控制放大器的增益。 双极性第二晶体管接收第二差分输入信号，并且第二晶体管向MOSFET施加调制的栅极电压。 MOSFET的漏极电压由第一差分输入信号调制，因此不期望地产生失真。 为了减小失真，调制栅极电压使MOSFET的漏极处的某一直流电压的交流分量降低，从而提高线性度。 由于没有使用电流源，所以放大器具有较大的余量，允许使用低工作电压进行工作。
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公开(公告)号：US09391577B2
公开(公告)日：2016-07-12
申请号：US14670031
申请日：2015-03-26
Applicant: Linear Technology Corporation
Inventor： Petrus M. Stroet
CPC classification number: H03G3/3042 , H03F1/0205 , H03F1/32 , H03F3/19 , H03F3/45098 , H03F2200/336 , H03F2200/451 , H03G1/0023 , H03G1/0029 , H04L27/34 , H04L27/368
Abstract: In a variable gain amplifier, a base of a bipolar first transistor receives a first differential input signal. The emitter of the first transistor is connected in series between a first resistor and a MOSFET coupled to ground. An output of the amplifier is a current through the collector. The conductivity of the MOSFET controls a gain of the amplifier. A bipolar second transistor receives a second differential input signal, and the second transistor provides a modulated gate voltage to the MOSFET. The drain voltage of the MOSFET is modulated by the first differential input signal and thus undesirably generates distortion. To reduce the distortion, the modulated gate voltage causes the AC component for a certain DC voltage at the drain of the MOSFET to be lowered, improving linearity. Since no current source is used, the amplifier has a large headroom, allowing operation using a low operating voltage.
Abstract translation: 在可变增益放大器中，双极性第一晶体管的基极接收第一差分输入信号。 第一晶体管的发射极串联在第一电阻和耦合到地的MOSFET之间。 放大器的输出是通过集电极的电流。 MOSFET的电导率控制放大器的增益。 双极性第二晶体管接收第二差分输入信号，并且第二晶体管向MOSFET施加调制的栅极电压。 MOSFET的漏极电压由第一差分输入信号调制，因此不期望地产生失真。 为了减小失真，调制栅极电压使MOSFET的漏极处的某一直流电压的交流分量降低，从而提高线性度。 由于没有使用电流源，所以放大器具有较大的余量，允许使用低工作电压进行工作。
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公开(公告)号：US09106202B2
公开(公告)日：2015-08-11
申请号：US14189652
申请日：2014-02-25
Applicant: Linear Technology Corporation
Inventor： Petrus M. Stroet
Abstract: A poly-phase filter receives inphase input signals I and Ī and quadrature input signals Q and Q, and provides inphase output signals Iout and Iout and quadrature output signals Qout and Qout. The capacitance of each variable capacitor connected to the terminals providing inphase output signals Iout and Iout is and the capacitance of each variable capacitor connected to the terminals providing quadrature output signals Qout and Qout, are different in value, and preferably by twice a predetermined value. This is because adjustment to the capacitance values may be made to each set of variable capacitors by the predetermined value.
Abstract translation: 多相滤波器接收同相输入信号I和Ī和正交输入信号Q和Q，并提供同相输出信号Iout和Iout以及正交输出信号Qout和Qout。 连接到提供同相输出信号Iout和Iout的端子的每个可变电容器的电容是连接到提供正交输出信号Qout和Qout的端子的每个可变电容器的电容值，并且优选地是预定值的两倍。 这是因为可以通过预定值对每组可变电容器调整电容值。
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公开(公告)号：US08901988B2
公开(公告)日：2014-12-02
申请号：US14061479
申请日：2013-10-23
Applicant: Linear Technology Corporation
Inventor： Petrus M. Stroet
CPC classification number: H03D7/1433 , H03D7/1458 , H03D7/18 , H03D2200/0023
Abstract: A single-balanced balun mixer circuit includes a balun with a center tap connected to a differential pair with a tail resistor. The balun receives a first input signal and a second signal at the single-ended input terminal and the center tap, respectively. Such a balun mixer may be used as an up-converter mixer by supplying a baseband or intermediate signal at the center tap and a local oscillator (LO) signal at the single-ended input terminal.
Abstract translation: 单平衡 - 不平衡变压器电路包括一个平衡 - 不平衡转换器，中间抽头连接到带有尾电阻的差分对。 平衡 - 不平衡变换器分别在单端输入端和中心抽头处接收第一输入信号和第二信号。 通过在中心抽头提供基带或中间信号以及单端输入端的本地振荡器（LO）信号，可以将这种平衡 - 不平衡变压器混频器用作升压转换器混频器。
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