Title:
ラジオ受信機
Document Type and Number:
Japanese Patent JP4267205
Kind Code:
B2
Abstract:
A radio receiver has an input coupled to first and second quadrature related low-IF frequency translation stages generating IF signals at substantially half the channel bandwidth or channel spacing. The IF signals which may be optionally filtered in a pre-filter, for example a polyphase filter, are applied to first and second cross-coupled continuous time, low pass Sigma-Delta modulators. The modulators include transconductor-capacitor integrators, all but the first integrators of which are cross-coupled by gyrators set to resonate at the IF frequency. Outputs of the Sigma-Delta modulators include 1 bit oversampled signals. The oversampled signals may be filtered in first decimation stages which provide anti-aliasing. The decimated signals are derotated and decimated in a second decimation means to provide outputs at base band. The base band outputs are equalized and demodulated to provide an output. The input signal may be frequency translated to zero IF and then filtered in low pass filters.
Inventors:
Ant danish
Application Number:
JP2000576543A
Publication Date:
May 27, 2009
Filing Date:
September 14, 1999
Export Citation:
Assignee:
NXP B.V.
International Classes:
H03M3/02; H03D3/00; H03D7/16; H03H11/22; H04B1/10; H04B14/06
Domestic Patent References:
| JP9191253A | ||||
| JP10501673A |
Other References:
Stephen A Jantzi,Quadrature Bandpass ΔΣ Modulation for Digital Radio,IEEE Journal of Solid-State Circuits,IEEE,1997年12月,Vol.32 No.12,pp.1935-1950
Attorney, Agent or Firm:
Kenji Yoshitake
Hidetoshi Tachibana
Takeshi Sekine
Takahashi
Kenji Sugimura
Tatsuya Sawada
Hidetoshi Tachibana
Takeshi Sekine
Takahashi
Kenji Sugimura
Tatsuya Sawada