| dc.description.abstract | The subject of this paper is the design and analysis of single-stage
cascode amplifiers. We use circuit simulation software to find out the
gain we need under different transistor sizes and different transistor gate
bias voltages, and then design the matching circuit to have sufficient
stability and return loss.
In Chapter 2, we use the TSMC 0.18-μm CMOS process to simulate
a single-stage stacked amplifier for analysis. We first fix the width of the
transistor, change the gate bias voltage of the transistor, and simulate
the maximum gain at 24 GHz and 35 GHz with a finger. Stability,
NFmin, DC power consumption trends. And use load pull simulation
to obtain the maximum power added efficiency and maximum output
power of different transistor size and transistor gate bias and center
frequency of 24 GHz and 35 GHz, respectively, corresponding to them
the gain and load impedance.
In Chapter 3,we use TSMC 0.18-μm CMOS process to design a
single-stage cascode amplifier with a center frequency of 35 GHz. Under
a supply voltage of 3.3 V, it is expected to have a gain of 6 dB.
The matching network uses L section The matching capacitor is a MIM
capacitor, and the part of the short-circuit stub is brought into the circuit
using full-wave electromagnetic analysis (EM) simulation instead
of matching inductance. The simulation result is that the input return
loss is greater than 20 dB, the output return loss is greater than 20 dB,
the gain is greater than 7.6 dB, and the DC power consumption is 58.9
II
mW. . However, the measurement results show that the input return
loss is greater than 16 dB, the output return loss is greater than 3.4
dB, the gain is greater than 3.7 dB, and the DC power consumption is
54.45 mW. We found that the main reason for the decrease in gain may
be that the output loss is larger than we expected. Therefore, in the
re-simulation of debugging, connect an inductor in series at the output
terminal and then re-match. The re-simulation results can indeed be
more consistent with the measurement results.
This paper has successfully designed a single-stage cascode amplifier.
Although the measurement results are far from the simulation
results, after re-simulation, part of the reason for this difference can be
inferred. | en_US |