Highly-integrated transmitter RFIC with monolithic narrowband tuning for digital cellular handsets

Q-enhanced LC bandpass filters for integrated wireless applications

“…In the radio system context, the performance relative to interferers outside the service band is also important, and with a properly designed -enhanced preselect filter, the receiver's dynamic range relative to such signals is significantly increased. To quantify this effect, let the input referred compression point of the filter be written as (5) where and are the input and output compression points of the filter in dBm, and is the filter gain in dB at frequency For a second-order (one-pole) bandpass design, may be approximated for frequencies outside the passband as (6) where is the midband gain, is the center frequency, and is the filter bandwidth. Combining (5) and (6) gives (7) Noting that compression within the filter will occur first at the output due to the filter's gain, and that the output compression point is fixed by the bias point and power consumption of the resonator circuits, this equation suggests that input compression and dynamic range should improve at a rate of approximately 6 dB per octave away from the filter's edge.…”

50 years of communication circuits at ISSCC

“…By the mid-1990s, worldwide wireless activity focused on chips for second-generation digital-cell phone systems, as typified by the paper, "Highly-Integrated Transmitter RFIC with Monolithic Narrowband Tuning for Digital Cellular Handsets" (K. Negus, B. Koupal, J. Wholey, K. Carter, D. Millicker, C. Snapp, N. Marion [23]) from 1994's ISSCC, which also marked the first wirelesscommunications session. By 1995, several ISSCC papers were describing highly-integrated chips or chipsets for GSM cell phones (e.g., "A 2.7V to 4.5V Single-Chip GSM Transceiver RF Integrated Circuit" (T. Stetzler, I.…”