1. An semiconductor device comprising:
a subcollector layer;
a collector layer disposed on a first portion of the subcollector layer;
a base layer disposed on the collector layer;
a first emitter finger disposed on a first portion of the base layer;
a second emitter finger disposed on a second portion of the base layer;
a base contact disposed on a third portion of the base layer;
a first emitter contact disposed on the first emitter finger;
a second emitter contact disposed on the second emitter finger;
a collector contact disposed on a second portion of the subcollector layer; and
an electrically conductive airbridge having a first end connected to the first emitter contact and a second end connected to the collector contact.
2. An ESD semiconductor device comprising:
a subcollector layer having a first portion, a second portion, and an insulating portion electrically isolating the first portion from the second portion;
a first collector layer disposed on the first portion of the subcollector layer;
a first base layer disposed on the first collector layer;
a first emitter finger disposed on the first base layer;
a second emitter finger disposed on the first base layer;
a first base contact disposed on the first base layer, the first base contact disposed between the first and second emitter finger;
a first collector contact in electrical contact with the first collector layer, the first emitter finger, and a first output port;
a second collector layer disposed on the second portion of the subcollector layer;
a second base layer disposed on the second collector layer;
a third emitter finger disposed on the second base layer;
a second base contact disposed on the second base layer;
a conductor having a first end in electrical contact with the first base contact and a second end in electrical contact to the third emitter finger; and
a second conductor in electrical contact with the second base layer, the second emitter finger, and a second output port.
3. The device of claim 2 wherein an area defined by a contact area of the first emitter finger and the first base layer is less than an area defined by a contact area of the third emitter finger and the second base layer.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A digital reception apparatus, comprising:
a receiver that performs reception processing on a received signal,
an adjuster that adjusts an amplitude of the received signal after the reception processing;
a distortion estimator that estimates a non-linear distortion of the amplitude adjusted signal, the non-linear distortion being caused by the reception processing;
a distortion corrector that performs a distortion correction based on the estimated non-linear distortion;
a controller that controls the adjuster based on a gain control signal such that an amplitude of a desired signal contained in the distortion corrected signal approaches a required level,
wherein the distortion estimator estimates the non-linear distortion of the amplitude adjusted signal with reference to the gain control signal.
2. The digital reception apparatus according to claim 1, further comprising:
a quadrature demodulator that performs quadrature demodulation processing on the amplitude adjusted signal.
3. The digital reception apparatus according to claim 1, further comprising:
a filter that limits a frequency band of the distortion corrected signal.
4. The digital reception apparatus according to claim 1, further comprising:
a quantizer that performs quantization on the amplitude adjusted signal.
5. The digital reception apparatus according to claim 4, wherein the quantizer performs linear quantization on the amplitude adjusted signal.
6. The digital reception apparatus according to claim 4, wherein the quantizer performs non-linear quantization on the amplitude adjusted signal.
7. The digital reception apparatus according to claim 6, wherein the distortion corrector performs distortion correction on the non-linear quantized signal, using a quantization characteristic of the quantizer.
8. The digital reception apparatus according to claim 7, further comprising:
a filter that limits a frequency band of the distortion corrected non-linear quantized signal.