Transistor amplifier stage
First Claim
Patent Images
1. A transistor amplifier stage, comprising:
- an npn amplifier transistor having a base, an emitter and a collector;
an alternating voltage input terminal connected to the base of the npn amplifier transistor;
a fixed potential connected to the emitter of the npn amplifier transistor;
an alternating voltage output terminal connected to the collector of the npn amplifier transistor;
an active operating point stabilization unit having both first and second pnp transistors which, in turn, each have a base, an emitter and a collector, the stabilization unit positioned between a direct voltage input terminal and the base of the npn amplifier transistor, wherein the collector of the first pnp transistor is coupled to the base of the second pnp transistor, the base of the first pnp transistor is coupled to the emitter of the second pnp transistor, the emitter of the first pnp transistor is coupled to the direct voltage input terminal, and the collector of the second pnp transistor is coupled to the base of the npn amplifier transistor; and
a further circuit terminal coupled to the emitter of the second pnp transistor.
2 Assignments
0 Petitions
Accused Products
Abstract
A transistor amplifier stage, in particular an RF amplifier stage with an npn amplifier transistor, which is coupled with its base to an alternating voltage input terminal, with its emitter to a fixed potential, and with its collector to an alternating voltage output terminal. An active operating point stabilization unit with a first and a second pnp transistor is provided between a direct voltage input terminal and the base of the npn amplifier transistor.
-
Citations
6 Claims
-
1. A transistor amplifier stage, comprising:
-
an npn amplifier transistor having a base, an emitter and a collector; an alternating voltage input terminal connected to the base of the npn amplifier transistor; a fixed potential connected to the emitter of the npn amplifier transistor; an alternating voltage output terminal connected to the collector of the npn amplifier transistor; an active operating point stabilization unit having both first and second pnp transistors which, in turn, each have a base, an emitter and a collector, the stabilization unit positioned between a direct voltage input terminal and the base of the npn amplifier transistor, wherein the collector of the first pnp transistor is coupled to the base of the second pnp transistor, the base of the first pnp transistor is coupled to the emitter of the second pnp transistor, the emitter of the first pnp transistor is coupled to the direct voltage input terminal, and the collector of the second pnp transistor is coupled to the base of the npn amplifier transistor; and a further circuit terminal coupled to the emitter of the second pnp transistor. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification