Amplifiers – With semiconductor amplifying device – Including signal feedback means
Patent
1991-07-12
1992-06-23
LaRoche, Eugene R.
Amplifiers
With semiconductor amplifying device
Including signal feedback means
330290, H03F 134
Patent
active
051246678
ABSTRACT:
A wideband amplifier having a direct output (C) to which is connected a level shifting stage providing at least one level shifted output. A first transistor emitter follower (Q.sub.3) is arranged in series with at least one level shifting element (Q.sub.4). The first transistor (Q.sub.3) has first resistor (R.sub.2) disposed between its base and a supply voltage source (V.sub.cc). A negative feedback circuit (R.sub.F1) is coupled to at least one level shifted output. The level shifting stage also includes at least second and third transistors (Q.sub.20, Q.sub.30) whose bases are connected to one said level shifted output (S) and which are arranged so that their collectors form separate first and second outputs (S.sub.1, S.sub.2) respectively. A fourth emitter follower (Q'.sub.3) is cascaded between the first emitter follower (Q.sub.3) and the level shifting element (Q.sub.4). A fifth transistor (Q.sub.10) forms a current mirror circuit with said level shifting element and has its main current path connected in series between the main current path of the first emitter follower (Q.sub.3) and a terminal of the level shifting element (Q.sub.4) not connected to the fourth emitter folllower (Q'.sub.3).
REFERENCES:
patent: 4628279 (1986-12-01), Nelson
patent: 4728905 (1988-03-01), Zhiwei
patent: 4775843 (1988-10-01), Wilcox
patent: 4885548 (1989-12-01), Wakimoto et al.
patent: 4897616 (1990-01-01), Wang et al.
Dinh Tan
Franzblau Bernard
LaRoche Eugene R.
U.S. Philips Corporation
LandOfFree
Wideband amplifier having separate outputs does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wideband amplifier having separate outputs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wideband amplifier having separate outputs will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-935722