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US 8,676,148 B2Granted
Differential amplifier circuit and wireless receiving apparatus
AssigneeKabushiki Kaisha Toshiba
InventorYosuke Ogasawara
Life of this patent
Estimating the term…
Abstract
A differential amplifier circuit includes a source follower circuit to which is input one of the differential signals and a common source circuit that is connected in series with the source follower circuit and to which is input the other of the differential signals.
Claims14
A differential amplifier circuit, comprising:
- a source follower circuit configured to receive a first signal of differential signals;
- and
- a common source circuit connected in series with the source follower circuit and configured to receive a second signal of the differential signals, wherein
- the source follower circuit comprises:
- a first transistor configured to receive the first signal;
- and
- a second transistor configured to receive the second signal, and
- the common source circuit comprises:
- a third transistor connected in series with the first transistor and configured to receive the second signal;
- and
- a fourth transistor connected in series with the second transistor and configured to receive the first signal, wherein
- the first transistor, the second transistor, the third transistor and the fourth transistor are N-channel field-effect transistors, and wherein
- a first connection point between the first transistor and the third transistor is configured to generate a first output of differential outputs, and
- a second connection point between the second transistor and the fourth transistor is configured to generate a second output of differential outputs,
- and further comprising
- a first bias voltage setting circuit that sets a bias voltage of each of the first transistor and the second transistor;
- a second bias voltage setting circuit that sets a bias voltage of each of the third transistor and the fourth transistor;
- and
- a third bias voltage setting circuit that sets a bias voltage of each of the fifth transistor and the sixth transistor.
16 more elements
A differential amplifier circuit, comprising:
- a source follower circuit configured to receive a first signal of differential signals;
- and
- a common source circuit connected in series with the source follower circuit and configured to receive a second signal of the differential signals, wherein
- the source follower circuit comprises:
- a first transistor configured to receive the first signal;
- and
- a second transistor configured to receive the second signal, and
- the common source circuit comprises:
- a third transistor connected in series with the first transistor and configured to receive the second signal;
- and
- a fourth transistor connected in series with the second transistor and configured to receive the first signal, wherein
- the first transistor, the second transistor, the third transistor and the fourth transistor are N-channel field-effect transistors,
- further comprising
- a fifth transistor connected in parallel with the third transistor and configured to adjust a first transconductance of the third transistor;
- and
- a sixth transistor connected in parallel with the fourth transistor and configured to adjust a second transconductance of the fourth transistor.
13 more elements
A wireless receiving apparatus, comprising:
- a receiving antenna configured to receive a spatially-propagated radio-frequency signal;
- a low noise amplifier configured to perform differential amplification of the radio-frequency signal received by the receiving antenna;
- a mixer configured to convert the radio-frequency signal amplified by the low noise amplifier into a differential signal comprising one of a baseband signal or an intermediate frequency signal and output the differential signal;
- a buffer connected between the low noise amplifier and the mixer and configured as an amplifier circuit comprising a source follower circuit configured to receive a first signal of the differential signal, and a common source circuit configured to receive a second of the differential signal, wherein the source follower circuit and the common source circuit are mutually connected in series;
- and
- a lowpass filter configured to attenuate a high-pass component from the baseband signal or the intermediate frequency signal, wherein
- the source follower circuit comprises:
- a first transistor configured to receive the first signal;
- and
- a second transistor configured to receive the second signal, and
- the common source circuit comprises:
- a third transistor connected in series with the first transistor and configured to receive the second signal;
- and
- a fourth transistor connected in series with the second transistor and configured to receive the first signal, wherein
- the first transistor, the second transistor, the third transistor and the fourth transistor are N-channel field-effect transistors, and wherein
- a first connection point between the first transistor and the third transistor is configured to generate a first output of differential outputs, and
- a second connection point between the second transistor and the fourth transistor is configured to generate a second output of differential outputs,
- and further comprising
- a first bias voltage setting circuit that sets a bias voltage of each of the first transistor and the second transistor;
- a second bias voltage setting circuit that sets a bias voltage of each of the third transistor and the fourth transistor;
- and
- a third bias voltage setting circuit that sets a bias voltage of each of the fifth transistor and the sixth transistor.
19 more elements
A wireless receiving apparatus, comprising:
- a receiving antenna configured to receive a spatially-propagated radio-frequency signal;
- a low noise amplifier configured to perform differential amplification of the radio-frequency signal received by the receiving antenna;
- a mixer configured to convert the radio-frequency signal amplified by the low noise amplifier into a differential signal comprising one of a baseband signal or an intermediate frequency signal and output the differential signal;
- a buffer connected between the low noise amplifier and the mixer and configured as an amplifier circuit comprising a source follower circuit configured to receive a first signal of the differential signal, and a common source circuit configured to receive a second of the differential signal, wherein the source follower circuit and the common source circuit are mutually connected in series;
- and
- a lowpass filter configured to attenuate a high-pass component from the baseband signal or the intermediate frequency signal, wherein
- the source follower circuit comprises:
- a first transistor configured to receive the first signal;
- and
- a second transistor configured to receive the second signal, and
- the common source circuit comprises:
- a third transistor connected in series with the first transistor and configured to receive the second signal;
- and
- a fourth transistor connected in series with the second transistor and configured to receive the first signal, wherein
- the first transistor, the second transistor, the third transistor and the fourth transistor are N-channel field-effect transistors,
- further comprising:
- a fifth transistor connected in parallel with the third transistor and configured to adjust a first transconductance of the third transistor;
- and
- a sixth transistor connected in parallel with the fourth transistor and configured to adjust a second transconductance of the fourth transistor.
16 more elements
Dependencies are inferred from the claim text.