| 摘要 |
<p>A signal voltage applied between the input terminals (3, 4) is converted by means of a differential amplifier (T7-T10) into two phase-opposed signal currents which are inverted by means of a differential-to-single-ended converter (10) into a single-ended signal current. The converter (10) comprises a first and a second transistor (T1, T2) with a common gate electrode and a third and a fourth transistor (T3,T4) also with a common gate electrode, whilst the drain electrode of the third transistor (T3) is connected to the common gate electrode of the first and the second transistor (T1, T2). The common gate electrode of the third and the fourth transistor (T3, T4) is maintained at a voltage which is equal to the sum of one threshold voltage and two saturation voltages by means of a fifth transistor (T5) whose gate electrode is connected to the drain electrode and to a bias current source (I2). The output (5) of the amplifier can be driven by means of this converter (10) up to two saturation voltages of the negative supply terminal (1).</p> |
