Abstract: The field effect transistor includes a control terminal (G), a first main terminal (S) and a second main terminal (D1). The control terminal (G) is included to be coupled to gate voltage means which are adapted to provide a control voltage (Vg) which controls a flow of carriers (e) flowing from the first main terminal (S) to the second main terminal (D1). The field effect transistor further includes a third main terminal (D2) which is positioned and adapted in order to enable a high input resistance control current means (CS), which is coupled to the third main terminal (D2), to deviate part (e′) of the flow of carriers from the first main terminal (S) to the third main terminal (D2). The third main terminal is called the double drain (D2) of the field effect transistor.

Abstract: An output circuit for digital integrated circuit devices is presented, comprising a driving device with adjustable drive capability for generating an output pulse (OS), means (SENS) for monitoring the steepness of the output pulse (OS), and means (SEL) adjusting the drive capability of the driving device so as to minimize the difference between the monitored steepness and a predetermined steepness. In a preferred embodiment, said driving device comprises a plurality of driving stages (PM1-NM1, PM2-NM2, PM3-NM3, PM4-NM4, PM5-NM5) which can be activated independently from each other, and the means (SEL) for adjusting the drive capability comprises means for activating one or more driving stages from the plurality of driving stages (PM1-NM1, PM2-NM2, PM3-NM3, PM4-NM4, PM5-NM5).

Abstract: A differential mixer (DM) used in a telecommunication radio transmitter able to operate with a 3 Volt supply includes a silicon bipolar cross-connected pair of differential amplifiers (A; B) for receiving a first input voltage (LO) at a high frequency, a pair of current sources (I1; I2), and a voltage-to-current MOS converter (VIC) for receiving a second input voltage (VIN) at a lower frequency. The converter is adapted to convert the low frequency voltage to a differential current (INN) and is coupled to the junction points of the amplifiers and the current sources. The converter further includes a regulated differential cascode circuit (P1; P2) to which the low frequency input voltage (VIN) is applied via resistors (RI1; RI2) and which is coupled to the supply terminals (VCC; GND) of the mixer via two pairs of constant current sources (PB1, PB2; NB1, NB2) respectively.