Abstract: An integrated circuit (IC) includes multiple circuits isolated with respect to one another. Each circuit of the multiple circuits includes an inductor pair formed in a loop pattern on a same layer as at least one other inductor pair from another circuit of the multiple circuits, such that the inductor pair surrounds and is isolated from the at least one other inductor pair.

Abstract: An integrated circuit (IC) includes multiple circuits isolated with respect to one another. Each circuit of the multiple circuits includes an inductor pair formed in a loop pattern on a same layer as at least one other inductor pair from another circuit of the multiple circuits, such that the inductor pair surrounds and is isolated from the at least one other inductor pair.

Abstract: A multi-band low noise amplifier (LNA) includes multiple low noise amplifying circuits configured to selectively operate in corresponding frequency bands. The low noise amplifying circuits include corresponding amplifying units and degenerating units. The degenerating units include first inductors, which are arranged in loop patterns isolated from each other on a same layer, such that one first inductor surrounds at least one other first inductor. A current flows through a selected first inductor included in a selected low noise amplifying circuit of the low noise amplifying circuits.

Abstract: A programmable variable gain amplifier includes at least three amplifiers. A first amplifier is configured to amplify an input signal. A second amplifier, which includes a programmable output load stage, is configured to receive an output signal from the first amplifier and to output a first differential output signal. The output load stage includes multiple first switches and multiple first diode-connected transistors that are open-circuited or short-circuited by the first switches. A third amplifier, which includes a programmable current mirror input stage, is configured to receive the first differential output signal from the second amplifier through the current mirror input stage and to output a second differential output signal. The current mirror input stage includes multiple second switches and multiple second transistors that are open-circuited or short-circuited by the plurality of second switches.

Abstract: A signal converter includes a signal converting unit and a compensation unit. The signal converting unit generates intermediate differential signals at intermediate nodes in response to a single-ended signal. The compensation unit generates compensated differential signals at output nodes by minimizing phase and amplitude mismatch errors between the intermediate differential signals. The compensation unit includes a pair of transistors and a pair of capacitors configured in symmetry between the intermediate and output nodes. The signal converter of the present invention may be used to particular advantage in an RF receiver.

Abstract: A feedback-type variable gain amplifier including a first field effect transistor, a feedback circuit, and a load circuit. The first field effect transistor receives an input voltage signal through an input node, amplifies the input voltage signal, and outputs the amplified input voltage signal through an output node. The feedback circuit is coupled between the input node and the output node, and generates feedback impedance that is changed in response to a control signal. The load circuit is coupled between the output node and a voltage source, and generates load impedance that is changed in response to the control signal to cancel a change of input impedance due to a change of the feedback impedance. Therefore, since the input impedance is not changed when the gain of the amplifier is changed, a voltage standing wave ratio is good, and a range of gain control is broad.

Abstract: A wireless receiver includes a feedback path, and a main path. The feedback path feeds back a first signal at a predetermined frequency range to remove a desired signal at the predetermined frequency range, and the feedback path to outputs an accumulated blocker error signal. The predetermined frequency range is lower than a radio frequency (RF) range. The main path subtracts the accumulated blocker error signal from a second signal including a blocker signal at the RF range to generate a third signal and down-converts the third signal to output the first signal at the predetermined frequency range.

Abstract: A voltage reference circuit and a current reference circuit using a vertical bipolar junction transistor (BJT) implemented by a deep N-well complementary metal-oxide semiconductor (CMOS) process, wherein the voltage reference circuit generates a constant reference voltage regardless of temperature and includes an amplifier element having a positive input terminal and a negative input terminal, a first transistor, and a second transistor. The first transistor is electrically connected to the positive input terminal and the second transistor is electrically connected to the negative input terminal. Each of the first and second transistors is a vertical BJT implemented by a deep N-well CMOS process, and the reference voltage is calculated by adding a base-emitter voltage of one of the first and second transistors to a value obtained by multiplying a thermal voltage by a predetermined factor.

Abstract: A gain controllable wide-band low noise amplifier includes a first transistor coupled to an input node and an output node and amplifying an input signal to generate an output signal, a second transistor allowing the output signal to feedback to the input node, and a control circuit complementarily controlling transconductance of the first and second transistors.

Abstract: A differential circuit includes main transistors differentially coupled for converting differential input signals into main differential currents at output terminals. The differential circuit also includes compensation transistors coupled to the main transistors for converting the differential input signals into compensation differential currents at the output terminals. Each compensation differential current has an exponential current-voltage characteristic for improving linearity of the differential circuit.

Abstract: A signal converter includes a signal converting unit and a compensation unit. The signal converting unit generates intermediate differential signals at intermediate nodes in response to a single-ended signal. The compensation unit generates compensated differential signals at output nodes by minimizing phase and amplitude mismatch errors between the intermediate differential signals. The compensation unit includes a pair of transistors and a pair of capacitors configured in symmetry between the intermediate and output nodes. The signal converter of the present invention may be used to particular advantage in an RF receiver.

Abstract: A programmable variable gain amplifier includes at least three amplifiers. A first amplifier is configured to amplify an input signal. A second amplifier, which includes a programmable output load stage, is configured to receive an output signal from the first amplifier and to output a first differential output signal. The output load stage includes multiple first switches and multiple first diode-connected transistors that are open-circuited or short-circuited by the first switches. A third amplifier, which includes a programmable current mirror input stage, is configured to receive the first differential output signal from the second amplifier through the current mirror input stage and to output a second differential output signal. The current mirror input stage includes multiple second switches and multiple second transistors that are open-circuited or short-circuited by the plurality of second switches.

Abstract: An amplifier circuit includes: an amplification transistor, which is connected to an input node and an output node, amplifying an input signal and generating an output signal; and a load connected between the output node and a predetermined power supply node, wherein the amplification transistor is a vertical bipolar junction transistor. A variable gain amplifier circuit includes: a voltage converter converting a control voltage and outputting a converted control voltage; and an amplification transistor receiving the converted control signal from the voltage converter and amplifying an input signal to output an output signal whose gain is proportional to the control voltage, wherein the amplification transistor is a vertical bipolar junction transistor.

Abstract: A multi-band low noise amplifier (LNA) includes multiple low noise amplifying circuits configured to selectively operate in corresponding frequency bands. The low noise amplifying circuits include corresponding amplifying units and degenerating units. The degenerating units include first inductors, which are arranged in loop patterns isolated from each other on a same layer, such that one first inductor surrounds at least one other first inductor. A current flows through a selected first inductor included in a selected low noise amplifying circuit of the low noise amplifying circuits.

Abstract: A feedback-type variable gain amplifier including a first field effect transistor, a feedback circuit, and a load circuit. The first field effect transistor receives an input voltage signal through an input node, amplifies the input voltage signal, and outputs the amplified input voltage signal through an output node. The feedback circuit is coupled between the input node and the output node, and generates feedback impedance that is changed in response to a control signal. The load circuit is coupled between the output node and a voltage source, and generates load impedance that is changed in response to the control signal to cancel a change of input impedance due to a change of the feedback impedance. Therefore, since the input impedance is not changed when the gain of the amplifier is changed, a voltage standing wave ratio is good, and a range of gain control is broad.

Abstract: A voltage reference circuit and a current reference circuit using a vertical bipolar junction transistor (BJT) implemented by a deep N-well complementary metal-oxide semiconductor (CMOS) process, wherein the voltage reference circuit generates a constant reference voltage regardless of temperature and includes an amplifier element having a positive input terminal and a negative input terminal, a first transistor, and a second transistor. The first transistor is electrically connected to the positive input terminal and the second transistor is electrically connected to the negative input terminal. Each of the first and second transistors is a vertical BJT implemented by a deep N-well CMOS process, and the reference voltage is calculated by adding a base-emitter voltage of one of the first and second transistors to a value obtained by multiplying a thermal voltage by a predetermined factor.

Abstract: A gain controllable wide-band low noise amplifier includes a first transistor coupled to an input node and an output node and amplifying an input signal to generate an output signal, a second transistor allowing the output signal to feedback to the input node, and a control circuit complementarily controlling transconductance of the first and second transistors.

Abstract: A differential circuit includes main transistors differentially coupled for converting differential input signals into main differential currents at output terminals. The differential circuit also includes compensation transistors coupled to the main transistors for converting the differential input signals into compensation differential currents at the output terminals. Each compensation differential current has an exponential current-voltage characteristic for improving linearity of the differential circuit.