MOS Cascode amplifier circuits are subject to long-term or instantaneous changes (degradation) of performance characteristics by excess substrate currents. These currents can be generated in the grounded source transistor of the cascode connected output transistors during peak excursions of drain-source voltage across the grounded source transistor when the output voltage of the MOS Cascode amplifier circuit is at a maximum. An improved MOS Cascode amplifier circuit arrangement includes a voltag...

The present invention provides a signal amplifying apparatus, for converting a first input signal into a first output signal. The signal amplifying apparatus includes an input stage circuit for receiving the first input signal; a cascoded circuit coupled to the input stage circuit, including a plurality of first cascoded transistors, wherein equivalent oxide thicknesses of the first cascoded transistors are not the same; an output stage circuit has a first input port coupled to the cascoded circ...

The present invention refers to a cascode amplifier suitable for amplifying a voltage signal present on the input terminal. The amplifier comprises at least one first transistor comprising a non-drivable input terminal that coincides with the input terminal of the amplifier, a non-drivable output terminal and a drivable terminal connected to a first polarization voltage. The amplifier comprises in addition at least one second transistor comprising a non-drivable input terminal in common with the...

An operational amplifier includes an input stage for producing a voltage signal in response to an input signal. An output stage includes an output transistor having a source coupled to a supply voltage and a gate coupled to receive the voltage signal. An output cascode transistor has a source coupled to a drain of the output transistor and a drain coupled to an output conductor. A gate control amplifier includes an input stage including a first input transistor having a control electrode coupled...

A low noise amplifier includes a cascode device which includes at least a first and a second transistor having a terminal in common. The output terminal of the second transistor is the output terminal of the cascode device and is coupled to the output terminal of the amplifier. The amplifier includes a first circuit means suitable for the polarization of the second transistor. The first circuit means is positioned between a supply voltage and another terminal of the second transistor. The amplif...

Buffer amplifiers are provided that demonstrate enhanced efficiency because they include current sources which are configured to be switched off during operational modes in which the amplifiers' output signals are not needed. Amplifier embodiments include charge-transfer transistors and filter capacitors that reduce spurious signals which may be generated by the switching operations.

A power amplifier circuit including a first transistor, a second transistor, and a power control circuit. The first transistor includes a first input and a first output. The second transistor includes a second input coupled in series with the first output of the first transistor. The input circuit is coupled to the second input of the second transistor. The control circuit includes a time delay circuit and a variable source.

A cascode connection circuit includes a first field effect transistor (FET) which has a source terminal and a drain terminal, the source terminal being connected to ground; a second FET which has a source terminal and a gate terminal, the source terminal being connected to the drain terminal of the first FET; and a first resistor and a first capacitor connected in series between the source terminal of the first FET and the gate terminal of the second FET. The first FET and the second FET are cas...

An amplifier circuit includes a first transistor having a control terminal that receives a first amplifier input, a first terminal, and a second. The amplifier circuit includes a transimpedance amplifier having an input that communicates with the first terminal of the first transistor, and an output. The amplifier circuit includes an output amplifier having an input that communicates with the output of the transimpedance amplifier and an output.

The band-limiting effects of parasitics are minimized in a two-stage amplifier wherein the active elements are operated in the common collector and the common base configurations. A pair of impedances Z.sub.1 and Z.sub.2 connect the emitter of one of the transistors to the emitter and the collector, respectively, of the other transistor. The collector of the latter transistor serves as the amplifier output terminal. Operating into a high impedance output load, the gain of the amplifier is given ...