900MHz全双工无线发射器参考设计

_Parameter

_{Conditions and Comments}

_Target

_Measured

_{Supply Current}

_{Shutdown mode (LDOEN = LOW), VCC = 4.5V (worst case)}

_1.7

_{For +17.5dBm at LPF output (VASK = 2.1)
Includes LMX2353 synthesizer and TCXO supply current.}

₁₄₁

₁₀₄

_{Tuning Range}

_{Range of VCO, freq determined by PLL}

_{902 to 928}

_{902 to 928}

_{LO Integrated Phase Error}

_{In 2MHz BW of demodulator, no modulation}

_1.6

_{Phase EVM}

_{EVM contribution from the above RMS phase error
(for small angles, approximate EVM by ΦERR/(360/2pi)}

_2.8

_{Magnitude EVM}

_{No modulation}

_0.2

_{1.0Mbps PN sequence BPSK modulation}

_{13 to 14}

_{Full-Power EVM}

_{VASK = 2.1V, 8:1 VSWR (worst-case angle)
Dominated by distortion due to VCO pulling}

_{VCC_MAIN = 2.7V, ICC = 106mA (50Ω pwr = +16.9dBm)}

₂₀

_40.2

_{VCC_MAIN = 3.3V, ICC = 114mA (50Ω pwr = +19.2dBm)}

₂₀

_43.6

_{VCC_MAIN = 4.0V, ICC = 138mA (50Ω pwr = +20.6dBm)}

₂₀

_53.3

_{VCC_MAIN = 4.5V, ICC = 299mA (50Ω pwr = +21.3dBm)}

₂₀

_30.1

_{Output Power}

<sub>50Ω load, 1.0Mbps BPSK modulation

(Power at balun output is approx 1dB higher, due to BPF, T-line, SMA)

EVM for specified VSWR (worst-case phase angle) is less than 20%</sub>

_{VASK = 2.1V
(for 1:1 VSWR tolerance)}

_{VCC_MAIN = 2.7V, ICC = 103mA}

_16.9

_{VCC_MAIN = 3.3V, ICC = 133mA}

_17.5

_19.2

_{VCC_MAIN = 4.0V, ICC = 141mA}

_20.6

_{VCC_MAIN = 4.5V, ICC = 145mA}

_21.3

_{VASK = 1.7V
(for 4:1 VSWR tolerance)}