| US 7,592,870 B2 | ||
| Low noise, low power, high linearity differential amplifier with a capacitive input impedance | ||
| Dejun Wang, Irvine, Calif. (US); and Hassan Elwan, Lake Forest, Calif. (US) | ||
| Assigned to Newport Media, Inc., Lake Forest, Calif. (US) | ||
| Filed on Aug. 13, 2007, as Appl. No. 11/837,638. | ||
| Prior Publication US 2009/0045876 A1, Feb. 19, 2009 | ||
| Int. Cl. H03F 3/45 (2006.01) | ||
| U.S. Cl. 330—258 [330/260] | 20 Claims |
| 1. A low noise, low power differential two-stage amplifier comprising:
an electrical element;
exactly one pair of input devices adapted to supply a capacitive load to said electrical element requiring said capacitive
load, wherein said pair of input devices are adapted to act as a voltage source follower;
a first resistive element operatively connected to said pair of input devices and adapted to receive said capacitive load
from said pair of input devices;
a second resistive element adapted to receive current from said first resistive element;
a third resistive element adapted to receive current from said first resistive element, wherein the second and third resistive
elements are sized differently than said first resistive element in order to provide a voltage gain;
a feedback loop operatively connected to said electrical element and the resistive elements; and
a gain transistor adapted to sense and increase a loop gain of said feedback loop while said feedback loop is closed.
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