By Forrest Mims
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Extra resources for Electrical - Engineer's Mini-Notebook Basic Semiconductor Circuits
The transmit signal may have an amplitude in excess of +25 dBm and duplex ﬁlter Tx–Rx isolation ﬁgures are typically 45–55 dB, giving transmit leakage in the range of −20 dBm to −30 dBm at the LNA input. 6 shows the typical output spectrum for a UMTS uplink signal with one DPCH subject to second-order distortion. 6 3GPP receiver sensitivity power level requirements. 7. Noise ﬁgure analysis: (a) idealized receiver; (b) power level diagram. It should be noted that most of the distortion power appears as DC and the use of a highpass ﬁlter after the mixer removes this signal before the baseband ampliﬁers .
Ior denotes the total transmitted power spectral density of the downlink signal measured at the Node B (base station) antenna connector, while Iˆor is the total received power spectral density at the UE antenna connector (integrated over (1 + α) times the chip rate, where α denotes the roll off factor of the pulse shape ﬁlter). Ioc is the total interference and noise power spectral density of a band limited white noise source measured at the UE’s antenna connector. Finally, Io is the total received signal power spectral density at the UE antenna connector.
It should be noted that most of the distortion power appears as DC and the use of a highpass ﬁlter after the mixer removes this signal before the baseband ampliﬁers . The level of distortion products for the modulated WCDMA signal may be related to the level of second-order distortion for the 2-tone CW case to provide a simple method of measuring and specifying the system components. 5 for equivalent input power.