摘要:
A system and a method for providing an input to a distributed power amplifying system are provided. In an embodiment, a distributed power amplifying system includes a plurality of amplifying sections (102, 104, 106, and 108) and a plurality of drivers (110, 112, 114, and 116). Each of the plurality of drivers receives a common transmit signal (118) and an individual control signal (120, 122, 124, and 126). Each of the plurality of drivers independently preconditions the common transmit signal, to provide a transmit output signal (128, 130, 132, and 134) to each of the plurality of amplifying sections. The common transmit signal provided to each of the plurality of drivers is preconditioned, based on the individual control signal.
摘要:
A vector signal processor (80) can include a digital to time converter (DTC), an RF memory (RFM) or an electronically tunable transmission line (ETTL) (82), a mixer, or other phase shifter (70) for receiving an output of the DTC or the ETTL, and a controller for selectively controlling the harmonic processing of the DTC, RFM or the ETTL and the phase processing of the mixer. The vector signal processor can uncouple a relative phase of a fundamental signal with respect to harmonics of the fundamental signal. The vector signal processor uses selective phase processing of the fundamental signal and related harmonic components. In a specific embodiment, the vector signal processor cancels harmonics of the fundamental signal and more specifically can cancel a third harmonic of the fundamental signal.
摘要:
A distributed amplifier arrangement (300) is provided in which a plurality of input signals (S1(t), . . . SN(t)) are separately controlled by a drive generator circuit (315) to produce modulation of a virtual load impedance at each amplifier stage. This permits each stage (302, 304, . . . 310) of the distributed amplifier (300) to operate at maximum efficiency by permitting the stage to produce an output voltage that approaches the supply voltage. As the output power is reduced, efficiency is maintained by systematically reducing the number of stages contributing to the output to the load.
摘要:
A DPC (300) includes: a frequency source (310) for generating a clock signal; a delay line (320) for receiving the clock signal and generating phase-shifted clock signals at output taps; a digital control device (330) for generating a control signal; and a windowing and selection circuit for generating the output signal, that includes sequential logic devices (500, 510, 520) and a combining network. A method for use in a DPC includes: receiving (400) a control signal based on a desired output signal that identifies a first output tap on the delay line; based on the control signal, selecting (410) at least two output taps on the delay line for receiving at least two different phase-shifted clock signals; and generating (420) an output signal based on the control signal and the received phase-shifted clock signals that is substantially the desired output signal.
摘要:
A frequency generator (10) includes a direct digital synthesizer (14) having an accumulator (18 or 28) for providing an interim output and a digital interpolator (16) for interpolating the interim output to provide an output signal with reduced electromagnetic interference. The digital interpolator can include at least one converter among a digital-to-phase converter (22) or a digital-to-time converter (32). The frequency generator can further include a digitally programmable spreading function (12) applied to an input of the direct digital synthesizer.
摘要:
A radio communications device 100 including a processor 120 having a digital signal processor (DSP) coupled to a transceiver 110. The transceiver includes a digital-to-phase synthesizer having one or more independently variable frequency or phase signal outputs coupled to a transmitter and/or to a receiver. The variable frequency and phase outputs of the digital-to phase synthesizer are mixed with corresponding received signals and are capable of frequency or phase modulating information signals for transmission. Amplitude modulated signals may be provided through polar modulation by combining synthesizer outputs at a summer.
摘要:
A direct digital synthesizer (30) with noise shaping circuitry can comprise a ROM-less direct digital synthesizer having a quantizer (40) and a noise shaping loop incorporating the quantizer for shaping a quantization noise due to noise from the quantizer. The noise shaping loop can comprise a noise shaping filter (44) and the noise shaping loop can feed back to the noise shaping filter a difference between an input signal (49) to the quantizer and an output signal (43) from the quantizer. The ROM-less direct digital synthesizer can further include a dither (39) combined at an input of the quantizer.
摘要:
A distributed amplifier consistent with certain embodiments of the present invention has a plurality of amplifier sections 1 through N (302, 306) with each amplifier section having an input and an output. A plurality of N input transmission line sections are connected in series, with inputs of the 1 through N amplifier sections interconnected at their inputs along the series of input transmission line sections. A plurality of N output transmission line sections are also connected in series, with outputs of the 1 through N amplifier sections interconnected at their outputs along the series of input transmission line sections. A load (160) can be driven by an output at the Nth amplifier section (108). A high-pass filter (310) connects a dummy load (150) to the output of the first amplifier section (302). The input and output transmission line sections can, for example, be lumped element T sections and the high-pass filter can be made of a lumped element half section. To achieve the desired stability enhancement, the high pass filter section has a cutoff frequency equal to or greater than the cutoff frequency of the output transmission line sections. A similar high pass filter and dummy load can be used in the input transmission line network.
摘要:
A configurable circuit consistent with certain embodiments has a variable length delay line (10), the delay line (10) having an input (24) and having N delay elements (12, 14, 16, 18, . . . , 20) to provide a plurality of N delayed outputs (T(0) through T(N)). The variable length delay line (10) also has a number of active delay elements determined by a program command. A configurable processing array (32) receives the delayed outputs from the active delay elements and secondary data (38). The configurable processing array has an array of configurable circuit elements (104, 130, 150). The configurable processing array is configured to process the delayed outputs and the secondary data (38) in a manner for which the invention is to be used. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.
摘要:
A circuit consistent with certain embodiments of the present invention has a source of N reference clock frequencies (230), where N is an integer greater than one. N frequency extender circuits (954) receive the N reference clock frequencies and generating N frequency extended output clock signals therefrom. A plurality of N seed slewers (958) produce N seed update values. A plurality of N seed registers (962) each receive one of the N seed update values and produce N seed masks therefrom. A plurality of N logic circuits (966) each receive one of the N seed masks and one of the N frequency extended output clock signals. Each of the N logic circuits (966) produce a pseudorandom sequence from the seed mask and the frequency extended output clock signal. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.