Super-Regenerative Detection 249
Table 10.1: Performance Comparison of State-of-the-Art Re ceivers
for Imaging Application
Parameters [89] [90] [259] DTL-CSRR
DTL-
SRR
Topology SRX SRX DC SRX SRX
Resonator Type
LC-tank LC-tank — TL-CSRR TL -SRR
Technology
Node
65-nm
CMOS
65-nm
CMOS
180-nm
BiCMOS
65-nm
CMOS
65-nm
CMOS
f
osc
(GHz) 144 183 103 95.5 135
Power (mW) 2.5 13.5 225 2.8 6.2
Sensitivity
(dBm)
-74 -72.5 -56 -78 -76.8
Bandwidth
(GHz)
0.94 1.4 20 0.56 0.53
NF (dB)
10.2 9.9 15 8.5 9.7
NEP (fW/
√
Hz) 1.3 1.5 17.8 0.67 0.9
Core Area
(mm
2
)
0.021 0.013 0.75 0.014 0.0085
10.4.3 Co mparison and Discussion
The performance of the measurement results of proposed SRXs is summarized
in Table 10.1 as well as the previous state-of-the-art receiver designs. Com-
pared to the direct conversion receiver [259], SRXs have a 16 ∼ 22 dB better
sensitivity due to a narrower receiver ba ndwidth. Compared to the traditional
SRX desig ns w ith LC-tank resonator [89, 90], the proposed SRXs show 30%
∼ 50% reduced NEP, 2.8 ∼ 4dB better sensitivity and 60% a rea r eduction,
which makes them well suited to the portable THz imaging with a large sensor
array.
10.5 Conclusion
As demonstrated in this section, both DTL-SRR and DTL- C SRR c an also be
applied in the super-regenerative receiver de sign with quench-controlled oscil-
lators to achieve be tter sensitivities. When compared to the conventional SRX
design with LC-tank resonator at the similar frequency, both proposed SRXs
at 96 GHz and 135 GHz show 2.8 ∼ 4 dB improved sensitivity. Especially, the
proposed SRXs at 135 GHz has 60% reduced core chip area. In the following
section, CMOS-based THz antenna design will be discussed.
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