Patent Number: 7,102,435

Title: Amplifier arrangement and control loop having the amplifier arrangement

Abstract: An amplifier arrangement and also a control loop having the amplifier arrangement are specified, wherein the amplifier arrangement is based on a Gilbert multiplier. Connected in parallel in this case with one of the transistors of the differential amplifier cells is an additional transistor, at which it is possible to tap off a signal that is proportional to the gain factor. Processing this signal in a suitable manner, for example in a control loop, makes it possible to compensate for temperature and manufacturing fluctuations and also to obtain a highly linear characteristic curve having a gain factor which can be set in a stable manner. In addition, the structure shown is current-saving and can be used, in particular, for application in radio frequency technology as an amplifier having a variable gain factor (VGA).

Inventors: Bosch; Martin (Lonsee, DE), Traub; Johann (Lauingen, DE)

Assignee: Infineon Technologies AG

International Classification: H03F 3/45 (20060101)

Expiration Date: 9/05/02018