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Summary This paper analyzes the thermally induced phase noise and the up‐conversion of flicker noise into phase noise of rotary traveling‐wave oscillator (RTWO). Based on the analyses, this paper extracts the closed‐form formulas for the thermal and flicker phase noise of the RTWO. This paper compares the theoretical results with appropriate simulations to evaluate the accuracy of the derived closed‐form formulas. Comparisons confirm the accuracy of the extracted phase noise formulas. By using the presented straightforward approach along with accurate phase noise formulas, the designers can understand the RTWO's design tradeoffs. Also, they can design the RTWO for a specific phase noise without needing lengthy simulations.

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A modified common source-common gate (CS-CG) low-noise transconductance amplifier (LNTA) with an improved noise figure (NF), operational bandwidth, and power consumption are analyzed in this paper. The common source (CS) stage of the modified LNTA is utilized for noise cancellation and transconductance enhancement of the common gate (CG) transistor. Using these, NF, bandwidth, and power consumption are improved without using extra active elements. Noise analyses show the modified CS-CG LNTA has lower NF than conventional CS-CG LNTA. The linearity of the modified CS-CG LNTA is calculated by Taylor series expression. Besides, a design procedure is proposed based on the obtained equations for linearity and NF. Finally, an ultra-wideband (UWB) surface acoustic wave (SAW-less) direct-conversion receiver is designed in 65 nm complementary metal-oxide-semiconductor (CMOS) technology. NF and third-order intercept point (IIP3) of the designed receiver are simulated as 5 dB and −2 dBm, respectively. The receiver consumes 18.4 mA from a 1.8 V supply voltage. KEYWORDS low noise amplifier (LNA), low-noise transconductance amplifier (LNTA), noise canceling LNTA, RF integrated circuits (RFIC), SAW-less receiver, ultra-wideband receiver 654

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