Patents by Inventor Kishi Takahiko
Kishi Takahiko has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7627295Abstract: A downconverter and upconverter are provided which can obtain a sufficient image rejection ratio in a low-Intermediate Frequency (IF) scheme while reducing power consumption and can suppress Error Vector Magnitude (EVM)-related degradation in a zero-IF scheme. A complex-coefficient transversal filter rejects one side of a positive or negative frequency, and converts a Radio Frequency (RF) signal to a complex RF signal configured by real and imaginary parts. A local oscillator outputs a real local signal with a set frequency. A half-complex mixer, connected to the complex-coefficient transversal filter and the local oscillator, performs a frequency conversion process by multiplying the complex RF signal output from the complex-coefficient transversal filter and the real local signal output from the local oscillator, and outputs a complex signal of a frequency separated by the set frequency from a frequency of the RF signal.Type: GrantFiled: April 13, 2006Date of Patent: December 1, 2009Assignee: Samsung Electronics Co., LtdInventors: Kishi Takahiko, Sato Takahiro, Won-Jin Baek, Jeong-Ki Choi
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Patent number: 7139329Abstract: A receiver has a low spurious level and a high frequency precision without increasing power consumption of a local oscillator. The receiver comprises first and second local oscillators; a phase locked loop operating based on an output of the first local oscillator; a first mixer for receiving an RF signal or an IF signal, and converting the received signal to a second IF signal according to an output signal of the phase locked loop; an analog-to-digital converter for converting an output signal of the first mixer to a digital signal; a second mixer for converting the digital signal to a detection process frequency according to an output of the second local oscillator; and a filter for bandpass filtering, interposed between the first mixer and the analog-to-digital converter or between the analog-to-digital converter and the second mixer.Type: GrantFiled: September 20, 2001Date of Patent: November 21, 2006Assignee: Samsung Electronics Co., Ltd.Inventor: Kishi Takahiko
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Publication number: 20060256216Abstract: A downconverter and upconverter are provided which can obtain a sufficient image rejection ratio in a low-Intermediate Frequency (IF) scheme while reducing power consumption and can suppress Error Vector Magnitude (EVM)-related degradation in a zero-IF scheme. A complex-coefficient transversal filter rejects one side of a positive or negative frequency, and converts a Radio Frequency (RF) signal to a complex RF signal configured by real and imaginary parts. A local oscillator outputs a real local signal with a set frequency. A half-complex mixer, connected to the complex-coefficient transversal filter and the local oscillator, performs a frequency conversion process by multiplying the complex RF signal output from the complex-coefficient transversal filter and the real local signal output from the local oscillator, and outputs a complex signal of a frequency separated by the set frequency from a frequency of the RF signal.Type: ApplicationFiled: April 13, 2006Publication date: November 16, 2006Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Kishi Takahiko, Sato Takahiro, Won-Jin Baek, Jeong-Ki Choi
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Patent number: 7127227Abstract: A digital down-converter having a low spurious level and a high frequency precision without increasing power consumption of a local oscillator. A first mixer receives, as a first IF input signal, a digital signal obtained by sampling a received signal with an RF signal or an IF signal, and converts the first IF input signal to a second IF signal using the first local oscillator. A digital filter suppresses an outband signal of the second IF signal provided from the first mixer. A second mixer converts an output of the digital filter to a detection process frequency using the second local oscillator. An available frequency step of the first local oscillator is larger than an available frequency step of the second local oscillator.Type: GrantFiled: September 20, 2001Date of Patent: October 24, 2006Assignee: Samsung Electronics Co., Ltd.Inventor: Kishi Takahiko
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Publication number: 20060009181Abstract: An automatic gain control device capable of reducing signal saturation or signal distortion caused by out-of-band signals of a filter or delay of a control signal. An AGC response control section compares a level of control voltage (‘V2_I terminal’ signal) output from an AGC control section b with a level of control voltage (‘V3_I terminal’ signal) output from an AGC control section c. If the ‘V3_I terminal’ signal is below the ‘V2_I terminal’ signal, an AGC amplifier is controlled by the ‘V3_I terminal’ signal. If the ‘V3_I terminal’ signal is above the ‘V2_I terminal’ signal, the AGC amplifier is controlled by the ‘V2_I terminal’ signal. In the latter case, control information of the AGC control section b is replaced by control information of the AGC control section c so that the AGC control section c controls the AGC amplifier c.Type: ApplicationFiled: June 28, 2005Publication date: January 12, 2006Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventor: Kishi Takahiko
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Publication number: 20020051503Abstract: A receiver has a low spurious level and a high frequency precision without increasing power consumption of a local oscillator. The receiver comprises first and second local oscillators; a phase locked loop operating based on an output of the first local oscillator; a first mixer for receiving an RF signal or an IF signal, and converting the received signal to a second IF signal according to an output signal of the phase locked loop; an analog-to-digital converter for converting an output signal of the first mixer to a digital signal; a second mixer for converting the digital signal to a detection process frequency according to an output of the second local oscillator; and a filter for bandpass filtering, interposed between the first mixer and the analog-to-digital converter or between the analog-to-digital converter and the second mixer.Type: ApplicationFiled: September 20, 2001Publication date: May 2, 2002Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventor: Kishi Takahiko
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Publication number: 20020048325Abstract: A digital down-converter having a low spurious level and a high frequency precision without increasing power consumption of a local oscillator. A first mixer receives, as a first IF input signal, a digital signal obtained by sampling a received signal with an RF signal or an IF signal, and converts the first IF input signal to a second IF signal using the first local oscillator. A digital filter suppresses an outband signal of the second IF signal provided from the first mixer. A second mixer converts an output of the digital filter to a detection process frequency using the second local oscillator. An available frequency step of the first local oscillator is larger than an available frequency step of the second local oscillator.Type: ApplicationFiled: September 20, 2001Publication date: April 25, 2002Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventor: Kishi Takahiko