首页|A 10 to 15 GHz Digital Step Attenuator With Robust Temperature Tolerance Across -55 ∘C to 125 ∘C
A 10 to 15 GHz Digital Step Attenuator With Robust Temperature Tolerance Across -55 ∘C to 125 ∘C
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NETL
NSTL
IEEE
This brief presents an efficient adaptive analog temperature compensation technique that stabilizes the amplitude and phase performance of an RF attenuator over an ultra-wide temperature range without compromising its other metrics. The approach utilizes an adaptive analog temperature-dependent voltage source (AATVS) to supply the binary digital control array, which indirectly biases the gate terminals of MOSFET switches in the attenuation unit. This method effectively mitigates thermal variations in on-resistance and intrinsic capacitance. To validate the technique, a 5-bit digital step attenuator (DSA) was designed and fabricated using a $0.13~\mu $ m SiGe BiCMOS process. The DSA exhibited excellent consistency in root-mean-square (RMS) amplitude and phase errors across $- 55~^{\circ }$ C to $125~^{\circ }$ C, achieving an RMS attenuation error below 0.24 dB, an RMS phase error under 2.3°, and an insertion loss (IL) better than 4.9 dB over 10–15 GHz. To the best of the authors’ knowledge, this letter is the first to implement an AATVS-based compensation mechanism in a 5-bit DSA, ensuring stable amplitude and phase accuracy under extreme thermal variations.
NETL
NSTL
IEEE
