Reconfigurable analog filter and integrated circuit including the same
AssigneeSamsung Electronics Co., Ltd.
InventorJisoo Chang
Life of this patent
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Abstract
A reconfigurable analog filter includes a transimpedance amplifier configured to convert a current signal into a voltage signal, an input capacitor configured to form a current-mode low pass filter together with an input impedance of the transimpedance amplifier, a variable load circuit including at least one switch configured to selectively close a circuit path to provide a resistor and/or a capacitor as a load of the transimpedance amplifier according to a control signal, and a low pass filter configured to filter the voltage signal.
Claims20
A reconfigurable analog filter comprising:
- a transimpedance amplifier configured to convert a current signal into a voltage signal;
- an input capacitor configured to form a current-mode low pass filter together with an input impedance of the transimpedance amplifier;
- a variable load circuit comprising at least one switch configured to selectively close a circuit path to provide a variable resistor as at least a portion of a load of the transimpedance amplifier according to a control signal;
- and
- a low pass filter configured to filter the voltage signal.
A reconfigurable analog filter comprising:
- a transimpedance amplifier configured to convert a current signal into a voltage signal;
- an input capacitor configured to form a current-mode low pass filter together with an input impedance of the transimpedance amplifier;
- a variable load circuit configured to provide a first impedance as a load of the transimpedance amplifier in a wideband mode and provide a second impedance lower than the first impedance as the load of the transimpedance amplifier in a narrowband mode, according to a control signal;
- and
- a low pass filter configured to filter the voltage signal,
- wherein the wideband mode and the narrowband mode are modes in which the reconfigurable analog filter provides a low pass filter characteristic with a first cutoff frequency and a second cutoff frequency, respectively, the second cutoff frequency being lower than the first cutoff frequency.
An integrated circuit comprising:
- a mixer configured to generate a current signal by performing down-conversion on an input signal according to a local oscillator signal;
- and
- a reconfigurable analog filter configured to provide a variable low pass filter cutoff frequency according to a control signal and filter the current signal, wherein
- the reconfigurable analog filter comprises:
- a transimpedance amplifier configured to convert the current signal into a voltage signal;
- an input capacitor configured to form a current-mode low pass filter together with an input impedance of the transimpedance amplifier;
- a variable load circuit configured to adjust a load impedance of the transimpedance amplifier according to the control signal and correspondingly vary the low pass filter cutoff frequency;
- and
- a low pass filter configured to filter the voltage signal.
Dependencies are inferred from the claim text.