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公开(公告)号：WO9714215A3
公开(公告)日：1997-05-15
申请号：PCT/IB9601040
申请日：1996-10-03
Applicant: PHILIPS ELECTRONICS NV , PHILIPS NORDEN AB
Inventor： BEHBAHANI FARBOD , FOTOWAT-AHMADY ALI , NAVID NASROLLAH S
CPC classification number: H03K5/2445 , H03K5/2418
Abstract: A comparator has a simple high frequency signal path from input to output formed by two differentially connected transistors (Q1, Q2) with an output transistor (Q8, Q3) connected to each. A current control circuit maintains a constant total current flowing through the differentially connected transistors (Q1, Q2). The ratio of currents flowing through the differentially connected transistors (Q1, Q2) is initially set by a control circuit (I1, I2), so that the output of the comparator is predictable when powered up. The control circuit then gradually releases control, so that there is a smooth transfer to control by a reference signal input to the comparator.
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公开(公告)号：WO2004095686A8
公开(公告)日：2005-03-10
申请号：PCT/IB2004001191
申请日：2004-04-20
Applicant: KONINKL PHILIPS ELECTRONICS NV , PARSA ALI , FOTOWAT-AHMADY ALI , FAGHFURI ALI , JENABI MAHTA , RIOU EMMANUEL , HAHN STEFFEN
Inventor： PARSA ALI , FOTOWAT-AHMADY ALI , FAGHFURI ALI , JENABI MAHTA , RIOU EMMANUEL , HAHN STEFFEN
IPC: H03C3/40
CPC classification number: H04L27/364 , H03C3/406
Abstract: A quadrature modulator and a method of calibrating same by applying a first test tone signal to an in-phase modulation branch input of the modulator and a ninety degree phase-shifted version of the first test tone signal to a quadrature modulation branch input of the modulator. The carrier leakage level in an output signal of the modulator is measured and in response base band dc offset voltages are adjusted to minimize the carrier leakage. A second test tone signal is applied to the in-phase modulation branch input and a ninety degree phase-shifted version of the second test tone signal to the quadrature modulation branch input. The level of an undesired upper sideband frequency component in the output signal is measured and in response base band gains the in-phase and quadrature modulation branches and a local oscillator phase error are adjusted to minimize the undesired sideband.
Abstract translation: 一种正交调制器及其校准方法，其通过将第一测试音调信号施加到调制器的同相调制分支输入端以及将第一测试音调信号的90度相移版本施加到调制器的正交调制分支输入端 。 测量调制器输出信号中的载波泄漏电平，并作为响应调整基带直流偏移电压以最小化载波泄漏。 第二测试音调信号被施加到同相调制支路输入，并且第二测试音调信号的90度相移版本被施加到正交调制支路输入。 测量输出信号中不希望的上边带频率分量的电平，并且作为响应，基带增益调整同相和正交调制分支以及本地振荡器相位误差以最小化不需要的边带。
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公开(公告)号：WO2004095686A3
公开(公告)日：2005-01-20
申请号：PCT/IB2004001191
申请日：2004-04-20
Applicant: KONINKL PHILIPS ELECTRONICS NV , PARSA ALI , FOTOWAT-AHMADY ALI , FAGHFURI ALI , JENABI MAHTA , RIOU EMMANUEL , HAHN STEFFEN
Inventor： PARSA ALI , FOTOWAT-AHMADY ALI , FAGHFURI ALI , JENABI MAHTA , RIOU EMMANUEL , HAHN STEFFEN
IPC: H03C3/40
CPC classification number: H04L27/364 , H03C3/406
Abstract: A quadrature modulator and a method of calibrating same by applying a first test tone signal to an in-phase modulation branch input of the modulator and a ninety degree phase-shifted version of the first test tone signal to a quadrature modulation branch input of the modulator. The carrier leakage level in an output signal of the modulator is measured and in response base band dc offset voltages are adjusted to minimize the carrier leakage. A second test tone signal is applied to the in-phase modulation branch input and a ninety degree phase-shifted version of the second test tone signal to the quadrature modulation branch input. The level of an undesired upper sideband frequency component in the output signal is measured and in response base band gains the in-phase and quadrature modulation branches and a local oscillator phase error are adjusted to minimize the undesired sideband.
Abstract translation: 正交调制器和通过将第一测试音信号施加到调制器的同相调制分支输入并将第一测试音调信号的九十度相移版本应用于调制器的正交调制分支输入的校准方法 。 测量调制器的输出信号中的载波泄漏电平，并根据基带调整直流偏移电压以最小化载波泄漏。 将第二测试音信号施加到同相调制分支输入和第二测试音调信号的九十度相移版本到正交调制分支输入。 测量输出信号中不期望的上边带频率分量的电平，并且响应于基带增益同相和正交调制分支，并且调整本地振荡器相位误差以最小化不期望的边带。
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